I have a different boat that you guys, but I opened mine and pulled the little lightbulb out and in goes a 'Red' LED that fits perfect. I got them off ebay and I believe it was a T-10 standard base plug as the key word. Took about 2 weeks for delivery but plug-and-play LEDs was SWEET. I bought 8 of them to do the whole boat for about $24.

I also spliced the wires and added some modules in the cup holder area from superbriteleds.com

Enjoy your mods. Post some pics.