61 is right around the transition from the 'dimpled' fender to the later style. Not sure. I thought it was 1960. As for fender fit issues..that's a can O' worms. I've seen origional front fenders, both German, same year(67) that are different from one another. Headlight shape along with the 'wandering' horn grill. Most often, the body has been hit, causing the front or rear apron to fold down, causing many problems. The most important place to fit is where the fender turns at the top of the apron, everywhere else can be modded. Pretty hard to describe.