EP = 1947 1/2 ton COMM truck
FP = 1948 " "
GP = 1949 " "
KP = 1952 " "
H = ?
You indicated 30s and 40s, but show no codes prior to 1947 (Advance-Design).
All 1/2-ton through 1-ton A-D rear fenders are the same for pickup-style fenders (and panel-style fenders are the same 47-55st).
40-46 fenders differ from other years - check the codes, but COMMercial/trucks are same for many models
The above fenders would be different from 30s fenders. I have not looked up the 30s codes.
