The first picture is 300ZX calipers on the scout Dana 44 axle on the rear of my CJ7.
The second pic is the part set for the same calipers to go on the rear XJ Dana 44 on my XJ.
The parts you need are these:
(2) 87 300 ZX calipers - junkyard $32
Geo Tracker 2dr thin rotors 89-98 $48
discard thickness 0.315
nominal thickness is 0.394
caliper brackets $35
87 300 ZX brake pads (2) pairs $35
10 dorman 610358 lugs $32.53
4 grade 8 metric bolts $15
6 grade 8 axle retainer bolts $24
two bearing preload spacers $10
parts for e-brake cables $15
All this adds up to about $250. You need to shorten the hard lines on the rear axle by 4" on each end. I used a double flare tool to just cut off the ones I had and make new ends. I hacksawed off the little bracket which holds the ZX caliper hose from the car in the junkyard. Then I welded that little bracket on my axle to hold the caliper hose. That saved me from having to make a brake hose bracket. And get the little clip that holds the hose to the bracket too. I made an e-brake cable holder out of pipe and washers. The last thing I did was put some 1/4" plate under the brake lines where they pass under my spring perches as a skid plate to keep the lines from being cut if the spring perch came down on a rock off road somewhere. I had to drill my rotors to 17/32" to fit the dorman lugs I bought. You need longer lugs because the rotors are thicker than the brake drum backing plate they are replacing. And I put my calipers on where the e-brake lever is at the top. When I bleed these I have to unbolt them from the bracket and turn the assembly so that the calipers are on top of the rotor so that the air will bleed out. I've been using this for about 6 months now and it works great. The ebrake works too. Since the piston is small for the ZX caliper, you do not have to change the CJ proportioning valve from stock for this rear disc setup.
Now the guy I got the brackets from has done this same thing for his AMC 20 axle. He made brackets and wheel bearing preload spacers for me. You need the spacers to compensate for the fact that you have taken out the brake drum backing plate. You can make your own by cutting up your backing plate. I bought some from a guy named Chris. You can contact Chris about buying brackets at this address: