Rocket1 has good advice, use your original fenders if possible. New front fenders from Gaslight, I believe, are not made quite right from what I have heard. I have heard they dies are wearing out, but I could be misinformed. They take some fitting to look decent. If your car is a coupe like in your avatar, Albrecht Towing in Ohio make excellent coupe/roadster/pickup rear fenders. I bought a pair 6 or 7 years ago for my 28 coupe and they were excellent. I couldn't tell them for originals, although there might be some minute differences. I would think 30/31 rear fenders are just as good as the 28/29 fenders as they are quite similar. Again, I would try to restore the original fenders on your model A if possible as they fit and look right when done.
Rusty Nelson