I've done a couple axle jobs and hate em because the gear oil smell. If I were going to do aftermarket I would have stuck with Strange or Moser. So what if the bearings aren't installed? You take an hour to drop them off at your local Napa who probably has a machine shop and can press the bearings on for you right. I've also done junkyard axles and differentials and again, just take it to the machine shop and get the bearings replaced and it's a lot cheaper. The good thing about these cars is that I'll bet that axle is the same one from F150, etc...and across many years so you can probably find one pretty easy and super cheap.
Im going to add too that I will never do axles and pumpkins again. Its a crappy job that I don't like so I'd rather pay "The Guy" to do it. I'm getting too old for that kinda work.
07 GT500 - magnaflow muffler deletes, JLT CF Big Air, Bama 91 tune, Eibach Sportlines
07 GT 'vert Whipple SC, full suspension, killer sound system to make you go deaf