Gdads, thank you for the additional research.
I need to talk to my machinist about the potential to have the hub holes machined larger.
The rotors slide over the 1/2" studs onto the hub and I belive the holes are large enough for the 9/16" studs but I need to confirm. I know the existing wheels (rollers) fit over the 9/16" studs I have on the rear as do the wheels I plan to use once I get tires.
