From what can find 547975 looks just like 9785581 that was used in 65 to 72 also fits others. Original GM 547975. BUICK OLDS PONTIAC original GM 54 7975 Bellhousing (shown in 12 pictures ). Works with Muncie, Borg Warner T-10 and Saginaw 3 and 4 speed transmissions and Ford transmissions.
