Check the specs on the missing parts. You may find they are the same as a 3/4-ton depending on exactly what you need. Much of the 3/4- and 1-ton suspension pieces are the same as some of the larger trucks.
Not everything by any means, and I don't recall exactly which pieces will swap but some time in the parts book will clarify that for you. You can find the parts book at
Master Parts Book.
