For what it’s worth I have the 1967 Ford vented rotors on our 72 Pre-L Summit Racing number SUM-BR-61053 with NAPA Number 641-1597 M12 studs. Haven’t seen any issues but don’t have many road hours either. You will need to push out the stock inch studs and ream the holes up. I used a .6225 inch reamer for the new metric studs.
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