I had the same problem with the 4 i have restored. After all I searched i finely had the brain storm to go to a local
U-Haul dealer and asked for the trailer marker
lights. They matched the ones on the trailer even down to the
U-Haul markings on the leans. Done a lot of restorations on
U-Haul scamps and even a
burro. So if any of my brothers or sister on the site need were do i find it, Most likely i found it. ASK