4.6L SOHC Mustang. Has increased RPM capability over stock cast iron flywheel.
Diaphragm clutch uses metric bolts and dowel pins.
4.6L engines may have 6 or 8 bolts to attach to the crankshaft. Check the engine code before ordering. Romeo built engines have 6 bolts and Windsor built engines have 8 bolts. All Cobra engines have 8 bolts.