Forget the Bulb
Oh Boy ! I have the same problem on my 92' 35.5. The combo light[ spreader and steaming light] on my boat is a Perko Model 1482/83. I could not locate the correct bulb so I went up the mast with a variety of halogen bulbs to try. Perko was no help. None worked. In the final analysis I guess I'll have to buy a complete new light unit.Let me know if you locate the correct bulb and what it is. ThanxFred Miller S/V M Squared