rear disc brakes on 8 3/4

I have the right stuff rear disc kit with parking brake. I got it as an open box deal on Amazon for just over $300 shipped and received in 2 days with prime
If it matters these work with 15" wheels according to there site
Installed it with BBP Yukon axles with green bearings and had the whole kit and axles in under an hour
The only thing I don't like about the kit is being able to get another set of discs in the future and which specific GM caliper it uses. Info that I can't find anywhere

*Set up has not been driven on as I am still assembling the car. Although I'm sure there will be no issues.
I need to weld the brake hose brackets on the rear(also can't decide to just get the dr diff offset spring kit and run a smaller spacer or not so I can weld all at once) and need to make or purchase new brake/fuel hard lines to do final install/plumbing

Overall I'm happy with them and can't wait to "brake" them in