Here are the adapters I got: http://www.ebay.com/itm/BA15D-G4-Ad...0&hash=item25666274f7#ht_2917wt_1344

Once you have those in place, there are G4 LEDs all over the place. They are not "marine" but so so cheap I just bought a bunch of extras. G4 LEDs are a bunch cheaper too.

-dan