okay guys after a week of searching here is what I found.

Miles at 9bolt.com obviously has some stuff.
TA performance makes a cover.
and diff technics in australia can get the following:
3.91 or 4.10 gears 350.00
full spool 300.00 (28 and 31 spline)
install kit (major) 110.00
custom detroit locker 1265.00 (ouch!!!!)
mini spool 75.00
shipping for kit, gears, spool 150.00 have in 3 days fed ex.

moser here in indiana can make 28 or 31 spline axles for a little over 400.00

I think Im going to go the ford nine route since I have a center section already and can get the whole housing for a 3rd gen with axles for 950.00 from moser but I wanted to let everyone know what I found.

It really is a shame gm cut cost and quit using the diff, I found several guys running 9 and 10 second commodores and holdens with a simple spool and gears. And they have had the diff for about 30 years now.

c ya and good hunting

 

I forgot to mention that a company there called Romac makes full spools and mini spools, and a company by the name of Lokka Lock Right (just Lock right here) makes a locker also but never could get prices.

 

I think they still do use the rear end. In fact I have been told that the GTO uses an independant vers of the 9 bolt and the gears and diff's and some other parts are the same. I have not been able to confirm this though. Does anybody know if this is true? If so it may help the aftermarket for our rears.

 

This is very interesting, let me know if this is true.
Thanks,