I bought and just received an LED third light from JC Whitney. It's 14" long x 3/4 wide. The roof scallop is about 14-3/4 wide so this light fits. I was tinkering with it a little and inorder for this light to fit, I used a heat gun to "contour" it a little. It looks like it'll work. Now I'll make the sheet metal backing to enclose the light in the scallop. I'll post pics when I'm done. This Whitney LED cost $16.
BTW anyone know or have an extras roof scallop that they'll part with? Thought I'd ask
He hasn't been seen since april 2013 .Hi Seon, how did the LED idea work out for you? Did you drill into the roof?