looks like the correct 1. a body backing plates are different from b, c, e, volare, aspen, trucks, etc. the depth on the 10 x 1 3/4 is different. i think moser is the same as dr diff when making axles and their axle won't fit with 10 x 1 3/4 backing plates. all the mentioned above will work with 10 x 2 1/2 or 11 x 2 1/2 shoes. beware of 11 x 2 inch shoes. a lot of c bodies came with 11 x 2 brakes.