A Saganaw power steering box from a 67 through 87 truck is the most common used. There are several ratios available also. The pump, brackets, & pulleys from cars & trucks from 63 up can also be used depending on what water pump and other accessories you have. You will need to procure a bracket kit for the box and cut the steering shaft.

GM switched to disc brakes in 72, they were also 5 lug. You would need the spindles for the 72 brakes.
Most aftermarket suppliers offer kits that use brackets to adapt whatever brake configuration you are looking for. It may be a better way than trying to find parts in a wrecking yard.
Fred

Last edited by rfs56trk; 04/02/2011 10:49 PM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine