If you haven't done so already, getting rid of the factory low hanging monster bracket for a shortened version that tucks up under the fender looks much better and shows more tire.
Plate frames are typically standard size and go on any bracket made for the same size plate unless you are looking for a special billet side mount/fender mount set up. Just depends on how much you want to spend, anything with HD associated will surely cost more than it's worth. lol
I got mine off ebay for $45, can't remember the name of the place, but it's a metal fabrication shop and the bracket is well made. I'll see if I can't find the guys name.