You can use 85-91 Mark VII rotors if you have a 87-93 5.0 Mustang. Pre 87 5.0s, which had puny 10" rotors, would need to have their spindles upgraded to the later model. Check out http://www.svo73mm.cjb.net./ it should answer all of your questions about your options for swapping to five-lugs. Note your limited wheel options with the Mark VII rotors.
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Most recent project: installed new HD T-5 w/Pro 5.0 Shifter, LUK Clutch, Prothane Engine and Trans mounts. Currently breaking in clutch.
Next: complete tune-up
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