The pirate jack kit is just a 73+ mopar disk conversion. It has big ball joint spindles and increases the track width just like the 73+ BBP conversion. Pirate Jack just orders the rotors as blanks and has them drilled for SBP and turns down the hub register a little.
So they’re good brakes, they use pretty much all stock, off the shelf 73+ mopar parts except for the rotors themselves. But they also increase track width and require large ball joint UCA’s or tapered ball joint adaptors. They also don’t fit all the original SBP drum wheels. They fit the SBP disk wheels, but some of the earlier drum wheels have center bores that are too small.
