So this is a unique situation I'm sure!

I am running Mustang GT calipers with 300M rotors. The clearance is very tight at the control arm where the ball joint is. So tight that to make them fit, the control arms were beaten with a BFH

Even so, the control arm grinds a groove into the back of the rotor.

It's about time for a brake job and I want to get the right spacing there. Any suggestions besides "trash it for a different brake kit"?