Easy method for Radiused rear wheel wells with a nice finished edge on the cheap the we did it in the 60s is check the top sealing lip on a 55 gallon drum like it was made for Gasser.
The Eastwood tool works well if you're not changing the shape of your wheelwell, and the wheelwell is round. If it has an odd shaped wheelwell, then as the wheel turns you have to readjust the roller to stay in contact. Another big problem is if there is any bodywork around the wheelwell, as it will pop any filler or at the least crack it. So you need to know before starting if the car has ever been hit.Eastwood sells a really nice tool for rolling fenders.
Hey Steve..... Ironic you should reply to this "older post" of mine today...... Just the day before yesterday I took a magic marker & some string .... measured the radius of the M/T's I picked up at the Spring swap meet in Canfield, Ohio and did a "let's see how this looks" on the rear fenderwell opening on the Opel.That will be a neat project , going back to an almost stock quarter, with a radius ! ! Are you going to tip the edge or have a small reveal on the outer edge ? Basically matching the front fender profile with a larger radius .....