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x2, looks like a front knuckle attached to the rear somehow and a stock front caliper would bolt right in place.
FYI Toyota did make factory disk brake full floating axles in the 9.5" diff housing. I am running one now and have a spare in my car port.

I would be glad for some tips how to do it simply, or if someone could tips me about a company that makes a bolt on kit.:
Is that parts from a 80?
No, from my understanding the 80 series runs 8" diffs. Mine are from a Post 1990 HD 70 series as they had the same diff size as the 60 series in the rear only FF and factory fitted with disk brakes
A rear, fzj80 full floater uses a 9.5" ring gear. The front is 8".
on a different tangent...is there a proven solution for disk brakes on the rear FJ60 axle, 1986 vintage, semi-float US truck?
Ive had good luck with the 4runner v6 calipers in the front and the chevy disc/monte carlo calipers in the rear. I did NOT swap out the brake master for the T100 stuff, and the brakes work well for me.
I do not have an E-brake with this setup.
You may want to look at getting an 80 series full floater axle, in the long run it would be easier to grind the perches off and have new ones welded on then to fiddle with custom brackets and such. Though you may need to swap your old third if your front isnt 4.11 ratio. Or better, upgrade your front diff to 4.11 if it is 3.73.
To convert to full float with discs, your gonna need,hub, spindles, bearings, axle shafts (maybe custom lengths) calipers with e-brakes, discs, e-brake cable connections, adapter plate for caliper welded on, hub flange (from axle shaft to hub), brake lines, etc. It adds up quick.
The other easy option would be the outers off of a full float 80 series with the axle shafts included, then cut off your outers and burn on the 80 series outers.
sorry for the sidebar discussion....
I have 4.88 gears in the front and back plus lockers, so it would cost me some additional $$ to change axle assemblies. What brackets are you using and what other modifications have you made for disk brakes on the rear of a FJ60 semifloat axle (OEM Drum setup). Would be nice if there was a good emergencey brake solution too. I've seen where some guy had a emergencey brake setup on the rear of his tC... rotor is mated to drveshaft flange and braket for caliper mates to rear of transfercase, never was sure that this was someone's custom setup or avalaibel for sale?
I think TSM and maybe tom woods sell t-case caliper e-brake kits. Apparently they work well but you should have a locker in the rear.
I used a HZJ73 rear axle with OE disc brakes. I don't know where you're from, but in my case it was the quickest, cheapest and easiest solution. I traded in my drumbrake rear axle (in need of a brakejob), paid 100 euros and took the HZJ axle with me. All i needed to do was to reweld the spring perches and put an adjustable proportioning valve in the brakeline.
If you're in Europe, this might be a good solution.
Works like a charm too!