Can you trim those circuit boards down without screwing them up? Never tried but shouldn't be too hard. Peterson/truck lite/grote are a few led light manufacturers that may work or be trimmed to fit.
As long as you don't cut into the circuit trace they can be trimmed. The one I cut up had 1/4" of plastic all the way around the board. So just trimming that slimmed it up by 1/2" total width which is where it was tight.