Nothing is ‘standard’ on a P40. Even some threaded fittings like nuts and bolts were made on-site as the boat was built. That said, I began the LED conversion of View[+]Finder in NZ nearly 16 years ago and the festoon bulbs for the floor ‘night-lites’ were the first. I used what was available from an auto parts store in NZ, but now Amazon has everything you need to replace incandescent bulbs with LED’s.
These are still considered “auto-parts” and are metric sized. The last festoon ones I bought on Amazon were ‘T10’ size. Arm yourself with a set of cheap metric calipers and measure what was there before. Order from Amazon and install.
The only tricky bit in my LED conversion was the double contact bulb for the reading lights. All the fuss I went through has been rendered redundant by the plethora of made-to-fit LED’s. All have now been converted to flat panel LED’s without replacing the fixture.
My only caution is to be aware of the voltage supplied by your battery when being charged versus the design spec of the LED. Cheap “12V” LED’s may fail on 14.4V; go for the better (more expensive) ones that incorporate a voltage regulator into the LED ‘bulb’ flat panel.
Donal
Donal B. Botkin
Belvedere, CA 94920