What rear ends are compatible with 73 Dart Custom

I'm trying to find a wheel to wheel rear end for my 73 Dart Custom at a "pick your part" and I'm wondering if there are other years/models I can search for that are compatible. Mine is a 225 slant with a 904, so I dont necessarily need to up to a beefier diff or anything, but I've got some rear end noise on my daily and I figure if I find a full replacement I can spend some time restoring etc and drop it in.