Quarter Master clutch friction disc, 7.25″ diameter, 1×23 spline: Used on most F2000 and F1600 cars. This single disc fits Tilton OT-II, AP F3, and Quarter Master 7-1/4″ Racing Clutches (V-Drive compatible). Not interchangeable with the 1×23 45 degree “Mopar” spline size. Sintered metallic friction material is for racing use only. Minimum recommended clutch disc thickness is 0.074″ in single-disc clutches or 0.089″ on dual disc clutches. New clutch discs measure 0.105″ thick. Take note, the JS F4 cars typically used the “Rally” clutches, with disc thickness of 0.25″. For full clutch assembly or to buy individual components, click here.