You can assemble your own kit if you are able to fabricate the caliper brackets.
I did mine with 78/80 K10 rotors, and 78/80 C10 calipers. I used a 1 inch bore Disc/drum M/C mounted under the floor.
I made plywood templates of the brackets, then had a friend cut them out of 5/8 steel plate.
I curious if you had to drill & tap the rotors to mount them to the hub? All the ones I've seen you would have to.
