I was skimming some other forums the other day and noticed a post that said something would match up (or would need to modified) on the 59/60 to accept the 57 grill. I can't seem to find it right now, but I do recall them saying that the fenders weren't the same.

I agree '57s are hard to find. I've managed to find a good deal on a '59 but wanted to make sure I would be able to get the '57 front end to fit perfectly.