Sorry, my boat is a 2001 310.
I plan to replace nav lights entirely with led units. (the ones where actual LED is red or green, not a filtered light.) The bulbs I am trying to replace are the ones in the cabin and cockpit....
And thanks to those who have responded so far!!
So I am starting to replace old lighting with led (on 2011 310). You would think at this point it would be super easy to find a web site etc that has an easy conversion chart for bulbs, but I have yet to find one. The bulbs I am still looking for are the larger festoons for perco sternight...