My plastic housings were toast as well.
I made these housings for mine. Used all 5.5" diameter LED lights from superbrightleds.com Housings are .040" thick 6061 aluminum and riveted with AN headed rivets.
After I made these and installed them, I discovered a place that had ones similar to the OEM's that I replaced. Ah well, mine are unique. I went for a "Corvette Look" with the three horizontal lights on each side, but it came out looking a bit 1930's German Industrial. I like 'em though