This is more or less what I have
http://lewismarine.com/images/products/9/955G_1.jpg
I'd love to get something similar with the LED. That link looks like the perfect solution assuming they'll fit in the fixture and are bright enough. You'd just get the white LEDS thought right. I would think putting the red & green behind red and green tinted lenses would be dim. I wonder if they'd be bright enough to be legal.