What parts can I transfer from a '96 to a '89Monty
 

Hello Gents.
I was doing some research and found this site, thanks for all the info I have found so far. I just bought a 1989 LWB that will be replacing a 1996 Monty. The '96's engine, tires, and paint are shot and I will probably sell it to a junk yard. It won't pass smog and unfortunately is not worth all the money to fix it up. What parts can I take from the 1996 that will be of good use in the '89? Somewhere I saw someone had taken the rear disk disk brakes from an '96 Monty and installed in in a '91, is this possible without major modifications/fabrication? If so, where can I find relevant information? Any and all suggestions for mods are very welcome!
Thanks. (both are USA models)