Is this any good or will it work for my 73 duster?

It will fit , the only reason he is say abodys before 73 is because it has small bolt pattern axles, and 73 and up A bodys are big bolt pattern but you can buy new one to get the big bolt pattern or have some C body axles cut down. These are hard to find and if it is complete housing, axles, backing plates, brake hardware, and drums, then its an ok deal as long as you can pick it up close and dont have to pay a hole lot in gas or shipping. my 2 cents