I haven't found one yet. I used the reverse side of a novelty plate, (silver back), and then put the SD plate over that, so it would have some sort of background beside just the back of the trailer wall. Then I put it all in my USCG Retired frame.
I still don't like it though. Waiting for someone to make a frame that will actually fit.
2015 Landmark Newport 365
2015 Ram 3500 4x4, CTD, DRW ,MC ,AISIN , 4.10's,
Six Burning Six Turning ! ,RVM 104