The one's I used were the Dr. Led's available at West Marine or other Marine Retailers. I cut and pasted below to show you it is the SMD LED series you need the round flat ones. They come in Cool White, very bright, I used warm white which is the same white the bulbs give you. The replacement "Bulb" has two bayonets, one set that sticks out one end and the other sticks straight up from the middle. That is the one you sue. You just cut off the bayonet coming straight out from the side. They are cool to touch and don't use any power! I changed every bulb, my running lights, anchor lights cock pit lights, are all cool white.
LED Replacement Bulbs for Reading
MR16, MR11, G4, Edison Medium Screw Base, Bayonet 15 Base (Single Contact, Double Contact Index, & Double Contact Non-Index), and Dome Light LED Conversion Kit.
Bayonet Magnum LEDTM
Specially designed to replace most single and double contact 15mm bayonet incandescent bulbs for reading lights.
G4 MR11 MR16
Specially designed to replace most "third degree burn " bi-pin halogen bulbs for reading lights.
Specially designed to replace most Edison medium screw base bulbs.
SMD LED Series
Specially designed to replace most incandescent bulbs for reading lights.