Honestly, for the sake of long term simplicity I would just go to DoctorDiff and buy a 73+ disk brake kit, either 10.95” or 11.75”. Because then all of your parts are off the shelf, OE Mopar parts. Instead of finding an aftermarket kit that uses custom parts or a mixture of parts from other manufacturers/brands/models.
You already have the large ball joint upper control arms, so, you just need the spindle and out and you can get all of that from DoctorDiff.
