nhprinter wrote:
Don't know if it helps, but this is a 2010 nav light:

Hmmm, I just looked at a pic of the 2010 240, and it appears to have the same light as mine and still have the same very small mounting area. They may have updated for some models and not others.
The Perko 0615 shown above is too wide. The mounting area on the 230/240 is very small, as though designed specifically for the light supplied. I think I'm pretty well stuck with what I've got, unless someone comes out with an LED bulb replacement that will work in it.