Fits L81-99 Evo B.T. with aftermarket flywheels equipped with 73-89 style oil pump & pinion gears. Same as MCS 507281 JIMS shaft; but with a longer bushing nose to accommodate 93-99 style cam covers. Use 24016-80 JIMS nut (MCS 978261) for flywheel side. Use with 26349-73A (MCS 504235) 73-89 oil pump drive gear and 26345-73 (MCS 512130) 73-99 B.T. oil pump driven gear and 77-89 type pinion gear and keys. Use with 54-89 JIMS nut (24023-54 / MCS 978263) on pinion gear side. End oiling. Note:OEM 90-99 Evo Big Twin models are equipped with the stock one piece flywheel/shaft design must use the S&S 90-99 Evo Big Twin pinion shaft conversion kit (Like MCS 904148) when converted to a 5-piece flywheel assembly.