You’ll have to make your own caliper brackets to run any of the modern Mopar calipers. No one is making kits for them as far as I know. Not that making brackets is super hard, but it would be a custom venture and you’d need to have access to a machine shop.
I run a set of the 13” cobra style brakes from DoctorDiff, they’re pretty impressive on an A-body, even hauling in my 275/35/18’s. You can see them pretty well here. I’m sure the brembo version would be even more impressive.
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