if you look at the conversion, most of the parts you want to be new. the rotors, pads seals and bearings..
they can be had fairly cheap (reasonable) from rock auto..

So the only used conversion things you really need are spindles and calipers...The spindles are the "same" on disk brakes used from 1984-1999. The calipers include up to 2005 if you do some research. Even the 5 lug discs off a VR will work, because you can switch back to 4 lug when you buy a new disk. Thats the only difference.