68 Cuda front brakes + spindles, 7.25 drums rear end, 14" wheels

yotah1 said
I'd have to check but it's completely standard setup. I believe it's 3.25" backspace, as the wheels are 5.5" wide.

NHscamp : CJ Pony Parts. Mustang retailer. Look for 66 Mustang Kelsey hayes calipers, they are exactly the same as the ones I had from stock on my Cuda (4 pistons).
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Not entirely true.
Mopar & Ford Kelsey Hayes 4 piston calipers use different hard line, & flex line attaching to the caliper.
If you wanted to use a Ford, KH caliper on a Mopar car, you could, but you would need to use the appropriate Ford rubber flex hose, to get the job done.