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For the front, older 5 lug hubs....available cheap at junk yards. There are usually enough dakotas in the yards near me to get a fresh set. Your location may be different.
for the rear, go to the junk yard and get the axle shafts from a 5 lug axle, or even the entire axle....you might find a suregrip and want to add that as well. That is how I got mine.
The rear end will with a little work. But the hubs won't not from that year. But you can buy a 91-96 hubs from any auto part store. Also don't be scared to start a new thread instead of brining up an old one.
For the front, you should be able to just buy 1990 rotors....check to see if both years use the same inner and outer bearings....
For the rear, find an 87 to 90 rear axle at the JY, pull the axle shafts...