They are small bolt pattern. But after looking closer, this is either a really old conversion, or someone made different rotors fit. The center of both front wheels has been opened up (poorly) to accommodate the hub. Looking in the unused holes in the rotor, it was meant for something else, and someone redrilled them for this.
interesting... probably some ford parts that were modified to fit, hence the opening of the wheel register. for a long time the KH rotors were near impossible to get so a lot of people went to great lengths making thing just work.
That looks exactly like what is on this car. So, it's all Mustang parts? Was there a thin wheel spacer that was part of that? There's an 1/8" spacer, I guess to make the wheel clear the caliper. And like I said, the center of the front wheels has been hacked out, but they appear to run true. I believe there is still one Volare left in the junkyard near me, so I think I'll grab the spindles from that and just convert this car to big bolt pattern. It'll just make life easier. I need to rebuild the front end anyway. It has an 8 3/4, and axles for that are fairly cheap.
mayhaps
I just bought that setup at a swap meet, then changed my mind about using it because I stumbled on a 73 and up big bolt pattern A body setup. The only spacer I saw was the one behind the rear seal for the back bearing. The SSBC brakes are a bolt on kit for A body Mopars like your 72 Dart. They bolt right on to factory 10" drum brake spindles. The calipers are the same thing as what would have came on your Dart, had it come with factory disc brakes. Mopar small bolt pattern rotors are 2 piece, but the Mustang rotors are one piece and have the slots in the side of the hub. You could move the wheel studs out to the 4.5 bolt pattern holes if you wanted. Look on your calipers and see if they have SSBC cast into the caliper body like the one in the pic below. If they don't, they are probably factory Mopar calipers. If your upper control arms have the small upper ball joint, it's more than likely an SSBC conversion. If you do decide to grab the Volare/Aspen disc setup, you will need some 73 and up, upper control arms that use the big ball joint because the F body spindle needs that ball joint instead of the small one. FABO member @blewbyu lives in FL, and had some factory BBP disc setup cores for sale a while back, so maybe contact him to see if has any left.
I will look at that tomorrow. I am aware of what's needed for the Volare spindle swap. I did it on my 74 Dart Sport. Like I said, the front end needs rebuilt anyway, so I'll just buy new control arms; they are readily available on Summit. The problem I see with this, is if I were to need replacement rotors, there's not a machine shop within 100 miles of me that can redrill them. Kinda the same issue with the Scarebird kit I was looking at; it bolts on, but the rotors have to be drilled, and no one around here can do that.
I have no intentions of rebuild the calipers on the car. New, or reman replacement calipers are readily available for relatively cheap. About $85 with a $20 core each, or $86 each for new ones from Rockauto. The rotors have been the complicated part the whole time, but it appears SSBC still sells them; for $192 each.
You DON'T have to do any type of drilling at all.
