i gave a guy a set of fenders this summer. he had a used set as well. he cut the rear half of the flares from each or the four fenders. he used two for the rear half of the rear flares, and two for the front half in sort of a criss-cross fashion. at first it was hard to follow his logic as he was explaining, but once i looked at a set of fenders it made sense. hes not done with it, but it does look pretty decent. the body lines of the rear half of the fender blend pretty well with the body line fore of the rear tire and frankly have a "factory" look.
Hank