I put the PerformanceOnline 6 lug brake kit on my 56 1/2ton. I am pretty sure that the rotors,calipers, pads and wheel studs are 73 K-5 Blazer parts, as I did some measureing of parts before I installed them. Just in case I needed to buy replacement/repair parts at some point in the future. You will re-use your original hubs, so you will want to convert to roller wheel bearings, the original ball wheel bearings won't give good service. I'm running with a 1 inch bore dual master cylinder, not power asist, located under the floor. Original rear brake shoe assemblies (added self adjusters to them) with 1 inch wheel cylinders. Pedal feel is real good, and brakes are very user freindly. No proportioning valve was needed, stops straight with the slightest bit of rear wheel lockup if you REALLY clamp down on it in the rain. I'm running 16 x 7 inch Chrome Smoothies. I am very happy with this set-up.
