Any 91-94 front door will fit. The rear is somewhat model specific, but is the same for all years. The rear door is the same design as the Roadmaster, but the roadmaster has 3 holes on the rear pillar for the flyaway panel, and the T pins/holes for the trim. Roadmaster sedans have holes in the door under the beltline trim that would have to be filled. The rear door looks like it might be repairable. Check with your local Vo-Tech school for repairs. They do not charge for labor, but the results may be a little amateurish. I had a local one do a fender, and the metal work was as good as any commercial shop. I was impressed. The paint and detail was another issue entirely. The clear coat did not make me happy. It started peeling after only 2 years. They also forgot to fill a couple of small items, and I am a little anal.
So, the best doors to use are any 91-94 Caprice front door, and any rear door from any 91-96 Caprice wagon. If you find a manual door, the internal parts from your door can be transplanted to the donor door. Remember to move the lock cylinder to the donor door.
You may find it easier to remove the front fender and get at the hinges that way. You could remove the door stops on the hinges to give you more room to work if you do not want to remove the fender. The bolts for the hinge to door are difficult to get at, and you need a special wrench to get to them.
You are looking at about $110 just for shipping for one door to Michigan from Florida by Greyhound. The minimum shipping by Greyhound is about $50, but the door weighs about 85-95 pounds, and may be the larger amount from anywhere. You should check the local pick-n-pull yard for the doors. You will make your wallet much happier.
You should have put this in the parts wanted section. Put your wants in the ISSF parts for sale/wanted section to give yourself a wider reach.
Tell your wife that you will have to drive it for another 3 years to get your money back in value from utility.