Brake size
The below info relates to the REAR only
IF the backing plate is A body 8 3/4 or A body 7 1/4 - 10x1.75 the distance from the shoe pads to the axle flange should be in the 0.58" range
If you have the drum the machined surface will be closer to 2" wide
If you have the shoe it will be 1 3/4 wide
Backing Plate Identification
The below info is based on the info in the Backing Plate Identification post above