What parts are you missing? the arm on the valve, i think I have a spare one, and the lil linkage that goes to the diff, you can still get that at the dealer, but IF you have more then a BB on your rig, you will need something different.
90 Comanche thing. Exo-cage, tube bed, with a few other things done Here is a link to some pics of it
If you have to ask why... Its a truggy thing and you wouldn't understand