Just in case this isn’t clear- the MBM and Pirate Jack kits are just 73+ Mopar disk brakes. Reproduction 73+ spindles, caliper brackets, rotors and calipers. They come with tapered ball joint adaptors like DoctorDiff has been selling for years so you can use the large ball joint spindles with the earlier small ball joint UCA’s.
The small bolt pattern version just has the 5x4” pattern drilled into the later style rotors and the outside of the hub register turned down to fit the earlier, smaller hub registers.
The price on the MBM kits is decent for everything they include, but keep in mind that probably means lower quality parts (like the ball joints, bearings, etc). I wouldn’t be surprised if the spindle and caliper brackets are all made by the same company though.
You can build out the same kit at DoctorDiff, and he specifies that he uses Timken bearings. He doesn’t sell a small bolt pattern version though.
