These competition flywheels to suit Subaru EJ20 and EJ25 series engines are machined from chrome moly steel with an integrally cut ring gear for the lowest possible moment of inertia. They are designed to allow the use of 7 1/4" (184mm) step fitment competition clutches. There are two versions, one for BC8 5 speed cars with EJ20 series engines and another for 6 speed EJ25 engine applications.
The clutch mounting holes are tapped M8 please refer the associated products link below for suitable clutch to flywheel mounting bolts.