Platform Fitment Bounds: Direct factory plug-and-play drop-in maintenance replacement or budget-friendly overhaul block designed explicitly for standard rocker boxes on early-generation 1999 to 2017 carburetor-equipped or electronic fuel injection (EFI) Harley-Davidson Twin Cam (Twin Cam 88, 96, 103, and 110) models:
Harley Softail Series (2000–2017): Fat Boy (FLSTF), Heritage Softail Classic (FLSTC), Softail Custom (FXSTC), Deluxe, and Night Train (FXSTB).
Harley Touring Series (1999–2016): Road King Standard / Classic (FLHR / FLHRC), Electra Glide Ultra Classic (FLHTCU), Street Glide (FLHX), and Road Glide (FLTR).
Harley Dyna Glide Series (1999–2017): Dyna Wide Glide (FXDWG), Low Rider (FXDL), Super Glide (FXD), and Street Bob (FXDB).
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or transmission safety overhaul hardware designed explicitly for standard internal primary chaincases on 1984 to present carburetor-equipped or electronic fuel injection (EFI) Harley-Davidson Big Twin models:
Harley Softail Series (1984–Up): Heritage Softail Classic (FLSTC), Fat Boy (FLSTF), Softail Custom (FXSTC), Springer Softail (FXSTS), Night Train (FXSTB), and Softail Standard (FXST).
Harley Touring Series (1984–Up): Road King (FLHR), Electra Glide Classic (FLHTC), Ultra Classic Electra Glide (FLHTCU), Tour Glide (FLT), and Street Glide (FLHX).
Harley FXR Super Glide Series (1984–1994): FXR, FXRS Low Rider, FXRT Sport Glide, and FXRDG Disc Glide configurations.
Harley Dyna Glide Generations (1991–Up): Dyna Sturgis (FXDB), Dyna Glide Custom (FXDC), Street Bob (FXDB), and Dyna Wide Glide (FXDWG).
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or transmission safety overhaul hardware designed explicitly for standard internal starter shaft interfaces on 1989 to present carburetor-equipped or electronic fuel injection (EFI) Harley-Davidson Big Twin models:
Harley Softail Series (1989–Up): Heritage Softail Classic (FLSTC), Fat Boy (FLSTF), Softail Custom (FXSTC), Springer Softail (FXSTS), Night Train (FXSTB), and Softail Standard (FXST).
Harley Touring Series (1989–Up): Road King (FLHR), Electra Glide Classic (FLHTC), Ultra Classic Electra Glide (FLHTCU), and Street Glide (FLHX).
Harley FXR Super Glide Series (1989–1994): FXR, FXRS Low Rider, FXRT Sport Glide, and FXRDG Disc Glide configurations.
Harley Dyna Glide Generations (1991–Up): Dyna Sturgis (FXDB), Dyna Glide Custom (FXDC), Street Bob (FXDB), and Dyna Wide Glide (FXDWG).
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or exhaust safety overhaul hardware designed explicitly for standard exhaust port flanges on classic 1966 to 1983 carburetor-equipped Harley-Davidson Shovelhead Big Twin engines:
Harley FL Electra Glide Series (1966–1983): FL, FLH, FLHF, FLHS, FLHT Tour Glide 74ci & 80ci overhead-valve engines.
Harley FX Super Glide Series (1971–1983): FX, FXE, FXEF, FXS Low Rider, FXSB, and FXWG Wide Glide manual 4-speed platforms.
Universally cross-matches classic vintage custom rigid choppers, retro bobbers, and swap-meet custom builds running original or aftermarket Shovelhead cylinder head engine architectures.
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or transmission safety overhaul hardware designed explicitly for standard internal clutch gear output assemblies on classic 1967 to 1970 Harley-Davidson Ironhead Sportster models:
Harley Ironhead Sportster Series (1967–1970): 900cc Sportster Electric Start (XLH / 1967–1970 models) and Kick Start Standard (XLCH / 1970 model only).
Platform Fitment Bounds: Direct factory performance drop-in maintenance replacement or suspension safety overhaul hardware package designed explicitly for standard original equipment 35mm front fork sliders on classic 1973 to 1987 carburetor-equipped Harley-Davidson Big Twin and Sportster models:
Harley Sportster XL Series (1973–1987): XLH883, XLH1100, XLH1200, XLCH900, Hugger, and early Evolution configurations running factory 35mm tubes.
Harley FX Super Glide Series (1973–1986): FX, FXE, FXEF, FXS Low Rider, and FXSB manual 4-speed configurations.
Note: Sized specifically for standard 35mm diameter fork legs built around part limit 45931-73; does not fit late-generation 1988-up 39mm or heavy 41mm/49mm front ends which require completely different retainer ring width profiles.
Brand: Genuine James Gaskets (Premium High-Performance Aftermarket Restoration Core)
Component Type: 5-Speed Manual Transmission Main Drive Gear Sprocket Output Shaft Oil Seal
Total Kit Volume Sizing: 2-Piece Complete Mechanical System Hardware Replacement Lot (Pack of 2 Seals)
Manufacturer Component Code: Part #12050 (Cross-matches industry standard JGI-12050 parameters)
Seal Lip Interface Configuration: Specialized high-efficiency double-lip (DL) internal tracking barrier
Material Base: Through-hardened structural metal ring casing blanketed in a state-of-the-art foam-covered oil-resistant elastomer matrix.
Country of Origin: Proudly Made in the United States of America (Modesto, California)
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or drivetrain safety overhaul hardware package designed explicitly for conventional 5-speed manual transmission mainshaft assemblies running on classic 1984 to 1994 carburetor-equipped Harley-Davidson Big Twin models:
Harley Softail Series (1984–1994): Heritage Softail Classic (FLSTC), Fat Boy (FLSTF), Softail Custom (FXSTC), Springer Softail (FXSTS), Night Train (FXSTB), and Softail Standard (FXST).
Harley Touring Series (1984–1994): Road King (FLHR), Electra Glide Classic (FLHTC), Ultra Classic Electra Glide (FLHTCU), and Tour Glide Ultra Classic (FLTCU).
Harley FXR Super Glide Series (1984–1994): FXR, FXRS Low Rider, FXRT Sport Glide, and FXRDG Disc Glide configurations.
Harley Dyna Glide Generations (1991–1994): Dyna Sturgis (FXDB), Dyna Glide Custom (FXDC), and Dyna Wide Glide (FXDWG). [1]
Platform Fitment Bounds: Direct performance factory plug-and-play drop-in maintenance replacement or engine safety rebuild hardware package designed explicitly for standard internal crankcase pinion shaft bearings on classic 1958 to 1986 carburetor-equipped Harley-Davidson Big Twin models:
Harley Panhead Series (1958–1965): FL, FLH, FLHF Duo-Glide and Electra Glide 74ci overhead-valve engines.
Harley Shovelhead Series (1966–1984): Electra Glide (FLH), Super Glide (FX / FXE), Low Rider (FXS), Fat Bob (FXEF), and Wide Glide (FXWG) 74ci & 80ci platforms.
Harley Early Evolution Big Twin (1984–1986): Softail (FXST) and early Touring models running the initial 1340cc block design before crankcase casting updates.
Up for sale is a pre-owned, genuine original equipment manufacturer (OEM) Harley-Davidson Evolution Sportster Cylinder Head, Rocker, and Valve Mechanics Package. Stamped with factory mold code reference #17579-95, this matched assembly lot was pulled straight from a garage teardown project.
Condition Details: Rough, rider-grade pre-owned builder core condition with noted defects. The cast aluminum cylinder head shells are structurally solid with zero cracked cooling fins or blown spark plug plug lines. The valvetrain mechanisms (all rocker arms, shafts, and valve springs) are intact, and the valves are straight and functional. Defects: The rear head's intake manifold mounting threads are stripped and require a Helicoil repair. The combustion chambers display cosmetic ding scars from piston fragments. This lot is a prime candidate for a custom engine builder who plans to clean out the combustion chambers, trim down the high spots, perform mild porting/polishing work, and repair the thread lines to salvage a budget-friendly motor.
Platform Fitment Bounds: Direct factory overhaul core or performance custom project motor build package designed explicitly for standard original equipment overhead valve configurations on 1986 to 2003 carburetor-equipped Harley-Davidson Evolution Sportster (XL) and early Buell models:
Sportster XL883 Series (1986–2003): XLH883 Standard, Deluxe, Hugger, Custom.
Sportster XL1200 Series (1988–2003): XLH1200 Standard, XL1200C Custom, XL1200S Sport (Check dual-plug head geometries).
Buell V-Twin Models (1995–2002): S1 Lightning, S3 Thunderbolt, M2 Cyclone running early Evolution-style cylinder head layouts.
Platform Fitment Bounds: Direct factory replacement maintenance component or valvetrain safety overhaul core designed explicitly for conventional cast aluminum cylinder head intake ports on classic 1957 to 1985 Harley-Davidson Ironhead Sportster models:
Harley Ironhead Sportster Series (1957–1985): XLH900, XLCH900, XLH1000, XLCH1000, Roadster, Hugger, XLT, and custom rigid configurations factory-equipped with 900cc or 1000cc overhead-valve parallel-twin engines.
Note: Fits standard intake valve positions; please verify your cylinder head guide bore measurements before final press-fit machining lines are executed.
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Platform Fitment Bounds: Direct performance factory maintenance replacement or drivetrain safety overhaul hardware package designed explicitly for standard original equipment right-side actuation 5-speed manual transmission gearboxes on classic 1980 to early 1986 Harley-Davidson Shovelhead and Evolution Big Twin models:
Harley Touring Series (1980–Early 1986): Tour Glide EFI/Carb (FLT / FLTC), Electra Glide Classic (FLHT / FLHTC).
Harley FXR Generation (1982–Early 1986): Super Glide II (FXR), Low Glide (FXRS), Sport Glide (FXRT), Disc Glide (FXRD).
Harley Softail Series (1984–Early 1985): Softail Standard (FXST) models factory-equipped with the early-style 5-speed gearbox layout.
Condition Details: Great vintage rider-grade pre-owned survivor condition. The cast aluminum lower plate mating face, central mainshaft sleeve bore, and three surrounding alignment screw eyelets are 100% solid, flat, crack-free, and un-warped with zero deep tool gouges or scoring. The pre-installed oil loop bypass hose line is fully flexible and tightly anchored inside its barb fittings with no dry-rot cracking or leaks as pictured. Cleaned, dry, and completely ready to bolt straight into your oiling rebuild.
Platform Fitment Bounds: Direct factory replacement maintenance casting or safety engine overhaul plate designed explicitly for conventional gearcase lower oil lines on late-construction classic 1977 to 1985 Harley-Davidson Ironhead Sportster models:
1977–1985 Harley-Davidson Sportster XLH 1000 Roadster / Touring / Deluxe Electric Start Platforms
1977–1979 Harley-Davidson Sportster XLCH 1000 Kick Start Configurations
1983–1984 Harley-Davidson Sportster XR1000 Street Tracker Platforms
Note: Precision engineered strictly for the updated late-era 1000cc Ironhead engine case revisions running the aluminum pump styles (#26204-77A); does not fit early 1957–1976 900cc/1000cc cases which ran the old-style zinc die-cast oil pumps (#26207-67A).
Platform Fitment Bounds: Direct factory plug-and-play drop-in maintenance replacement or safety restoration hardware designed explicitly for standard forward lubrication paths on classic 1992 to 1999 80-Cubic-Inch (1340cc) Evolution Big Twin Harley-Davidson models:
Harley Softail Series (1992–1999): Heritage Softail Classic (FLSTC), Fat Boy (FLSTF), Softail Custom (FXSTC), Springer Softail (FXSTS), Night Train (FXSTB), and Softail Standard (FXST).
Harley Touring Series (1992–1999): Electra Glide Standard / Classic (FLHT / FLHTC), Road King (FLHR), Road Glide (FLTR), and Tour Glide (FLTC) platforms.
Condition Details: Vintage rider-grade pre-owned survivor condition. The cast aluminum oil pump housing plate, internal gear pocket channels, and pass-through ports are 100% solid, crack-free, and un-warped. The precision mounting bolt holes and threaded ports feature crisp, true, un-stripped threads as pictured. The 12V pressure switch sensor unit is structurally sound with clean connection terminal posts. The components display an authentic period-correct silver aluminum patina and minor witness halos from field uninstallation, completely ready to wash out, test, and assemble.
Platform Fitment Bounds: Direct factory replacement maintenance package or safety engine overhaul core designed explicitly for conventional gearcase lower oil lines on late-construction classic 1977 to 1985 Harley-Davidson Ironhead Sportster models:
1977–1985 Harley-Davidson Sportster XLH 1000 Roadster / Touring / Deluxe Electric Start Platforms
1977–1979 Harley-Davidson Sportster XLCH 1000 Kick Start Configurations
1983–1984 Harley-Davidson Sportster XR1000 Street Tracker Platforms
Note: Precision engineered strictly for the updated late-era 1000cc Ironhead engine case revisions matching part sequence 26204-77A; does not fit early 1957–1976 900cc/1000cc cases which ran the old-style zinc die-cast oil pump body styles (#26207-67A).
