I'm having a challenge figuring out which front end parts to use. On one front end the backing plate is larger than the drum and the 2 adjusting holes are on the top. The other has backing plates that match the drum size with 1 adjusting hole on the bottom. What am I dealing with here? Which ones would be better to use? The smaller plate is supposed to be 52 gmc, the larger is supposed to be 50 chevy.
