Comet 20 Series Symmetric Polyester Drive belt - 3/4in. Top Width - 32 13/64in. Outside Circumference 203583A NOTE : The T.C. 88 and C.A.T. 99 Series Clutches for 5/8 wide belts are no longer available. The 20 and 30 Series Clutches and belts are somewhat interchangeable. 88 and 99 Series Drive Clutches can be replaced with 20 and 30 Series Drive Clutches.