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Set of two 5 1/2" clutch discs for the Tilton OT-III Dual Disc Clutch (Part No. 173-50). These discs have the standard hubs with a 1 5/32" x 26 spline pattern. This "Chevy" spline size is also popular in Indy cars, Can-Am, and GT-1.
Tilton's minimum recommended clutch disc thickness is 0.089" on dual disc clutches. New clutch discs measure 0.104" thick.