I was going to post pictures, but the gremlins appear to have gotten to my digital camera cable - I'll have to pay a trip to Radio Shack on Monday.
Can't find a tape measure to measure the wheel centre-to-wheel centre distance, but on the undamaged side of the car, I can fit two fingers in between the tyre and the black rubber between bumper and fender (just worked out what the fender is). On the left-hand side, I can't. Could be that I do indeed need new fenders. I guess I'll know for sure after I measure the wheel-centre distances.
Looking at it again, it does seem *very* plausible that I'll be needing new fenders after all. The only wheel-fender distance that is wrong is at the point of impact. More likely that the fender was pushed back than the wheel was pushed forward. Hmmmm.
On the new bumper front, I've been looking at the GT Racing catalog - specifically, the 964 RS America parts. If I need new fenders, they've got matching parts, too. Will these bolt right on (I wish), and how involved are they going to be to fit?