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Thanks for the image showing part numbers for bulbs, that was extremely helpful. Specialty marine was clear in stating that their bow lights, which look like mine, predate the transition to perko parts circa '84 and won't match my 1988 perko bow light.

Anyone know where to find such parts? My setup actually works, but the connection points to the bulb (or bulb, which I can replace thanks to the help here) are hit or miss. And because the setup is so firmly part of the boat, of course I can't easily twist the bulb around to get it working when we're underway.

Appreciate any help!