Okay I know I've said it before, but why wouldn't you purchase a set of Wilwood hats and rotors? With all the uncertainty of the Mustang units, then added cost of replacing studs etc. you've almost bought yourself a set of Wilwoods, hats are around $100 and rotors $80 and it's a bolt on upgrade.
In your case Larry it'd be pretty crazy not to match the Wilwood calipers with a decent set of rotors. I can't understand why Dennis didn't do it originally.
Just my 2 cents,
Julian
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