and a blue LED with matching base. The Perko cat. Number I used is 0964DPSTS in SS. If you can't find an LED with the standard base you can use an adapter for the two pin LED. I did at first and it fit just fine. I used a 2 1/2 inch hole saw and some starboard for the base. I tapped the starboard and screwed it to the 1 inch SS rail end fitting so that when the pole was stood up the fixture was flat facing up in the right position. It looks like a little flying saucer on the end of the pole. Hope this helps.