Calipers that I've compared have been the same size and shape if they were the same brand intended for the same axle.

Rears are smaller than fronts.

__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.