Small Bolt Drums

Of the 10" brakes, all SBP A-body rear brakes are 10 X 1 3/4". That is the shoe size. The drum will measure a bit more than that on width. Maximum drum diameters were either 10.060" or 10.090" depending on year and drum manufacturer. Usually, the 10.060 drums were the earlier ones and not stamped with the size limit. The later ones (such as the bell type) and aftermarket drums were usually the 10.090 type and that size was stamped into the drum.