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

if you're going with the 4 1/2" bolt pattern, make sure you get a set of brakes that match. If you decide to use the 10 X 2 1/2", get backing plates, shoes, hardware, wheel cylinders, and drums for that application. Same goes if you decide on the 11" brakes. They made different widths of brakes in both the 10" and 11". The individual parts need to match or things don't work right.