My experience with the 4 piston disks on a 67 Camaro did not requires anything special as far as wheels, the 72 Pontiac wagon did have caliper clearance issues. Cad CTS is the worst I ever saw.
In general you can add 3 mm spacers on a stock hub but 5mm is marginal. Gorilla makes a 7/16 Acorn nut with an extended shank, I cracked some foreign junk. 7 turns is OK, 5 are marginal.
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