Been thinking about a rear disc conversion for your 520/521/620/720? I have some freshly turned rotors that were originally on a '01 Tahoe. I believe they are Centric brand. Just add your calipers and brackets and start impressing the bishes.
$20/pr picked up in the Hillsboro area.
When the only tool you have is a hammer every problem starts to look like a hippy.
I guess whatever brackets you make for whichever calipers you like. Honestly, I don't even have a 6 lug rearend to test fit them on but if Escalade (ect) rims fit -- so should these rotors. They might work with Beebani brackets but I kinda doubt it. Just figured someone might get some use out of them if they were building their own system. The price is right anyway.
When the only tool you have is a hammer every problem starts to look like a hippy.