I picked up a pair of LED tail lights from a dealer in Australia, I
think for $70 or 75AU. These are of course the proper ones with amber
turn signals not the 1960s-vintage, same red lighting for turn and
brake, typical of US installations and illegal elsewhere. They are
also waterproof for boat trailers, so will likely last forever. Found
them on e-bay Australia.
Only problem I found was the 100mm square lights didn't quite cover
the Cobra trailer's round tail light cutout, so a backing plate needs
to be made.
Jim