Thanks for the info. I'm actually not planning on discs in th rear. I just need the bigger bolt pattern because all the front disc kits I found, only come with the 4 1/2" pattern and I'd like for all 4 wheels to match.
Want to replace my 7 1/4" rear end with an 8 3/4". Need to change my bolt pattern from 4' to 4 1/2", for disc brake conversion, so I'd prefer to upgrade the rear, rather than trying to find axles with a 4 1/2" pattern for the smaller rear.