2213-OD Drum, 4-1/2 Inch, Machined, With Flange, for mounting a 60T or 72T sprocket to Tristar wheels $24.95
72 Tooth Sprocket For #35 Chain, 4-1/2 Inch Brake Drum, Machined (One Piece) Riveted To Mini-Hub, 3/4 Inch Bore Part #2468 $69.95
72 Tooth Sprocket For #35 Chain, 4-1/2 Inch Brake Drum, Machined (One Piece) Riveted To Mini-Hub, 1 Inch Bore Part #2268 $69.95