The 7.5" axles and all brake parts will swap over to the 99-up 8.8" housing, so you won't need them unless you have to take them with the rearend you buy. You can get the quad shock (to frame) brackets off any Mustang GT. Year doesn't matter, just get the bolts too.
FYI, I recently heard from another source that FRPP (Ford Motorsport) has discontinued the complete rearends they were offering.
M-4006-B355
M-4006-B373
M-4001-S327
If you don't find one soon, you'll probably have to build your own.