If you're after factory stock parts, the '65-6 Kelsey Hayes brakes are a complete bolt-in with no mods except maybe the wheels. 13" ones won't work, but, some 14" ones will. It will depend on the year of the wheels and the width and offset they have. The '67-72 KH brakes will also bolt in and give you a dual hydraulic master cyl. The '73-6 factory discs have the 4 1/2" wheel stud pattern (instead of the factory 4" bolt pattern) and would need matching bolt pattern wheels and the upper control arms included in that swap. For K-member, use the '63-6 version as they're all the same regardless of engine size. The '65-6 ones have the sway bar holes drilled, but, you can drill the '64 and older K-member for the sway bar if you're going with a stock one. If you're not concerned about stock on the sway bar, get a Helwig setup. Using the '73-6 disc brakes may require you to swap the spindles from side to side to gain enough clearance to use a sway bar depending one which brand you use. In that case, you will have to get different brake hoses too as the stock ones won't reach where they attach to the frame rail. None of the steering linkage is needed to be changed with any of these setups. Aftermarket discs? There are many to choose from and you'll need to read about each one to see what else is needed to do the conversion. If you're going with a boosted system, choosing the right booster and brackets is important as there might be interference with the hood torsion bars with some of them on the '66 and older models.
