I haven't had a whole lot of time to fiddle with it. I have rigged something up but am still not completely satisfied.
I tossed the bridge that came with the fender as it was simply too bulky to be useful. I cut a hole in the fender and mounted an L bracket from below. Also,m using a mallet, I dimpled the part of the fender that hits the bridge.
It is still not quite snug enough against the bridge, so I will probably get the dremel out again and go back to my original plan of cutting out part of the fender the hits the bridge. I will have to fugure out how I am going to reuse the hole I drilled for the L bracket.
I will update once I have made progress. Thanks for the suggestions.