8 3/4 backing plates onto a small bolt with upgraded big bolt shafts

cudamark said
Not drums for that application. Imperials have a different wheel bolt pattern. 5 1/2" IIRC.

Yeah Sheesh that could have been an expensive mistake. They are not available any how. But I found some 11X3 drums with a 5x4.5 bolt pattern center hole is 2.813 inches. Not sure what size the center hole is on an 8 3/4