I just replaced this, it works, the boot on the spreader is a bit saggy but I put in a different light and moved the spreader switch. The previous owner put in an led bulb.
This is what I purchased. White/Red, I had it in my last boat, works great. You can buy anywhere, prices vary and change. I ran a wire down to my panel for the spreaders and put them on a spare toggle switch on the dash.
Touch Dome LED Dome Light is beautifully designed, elegantly functional and brilliantly engineered to be completely sealed with no o-rings, baffles, or switches to wear out. Unlike old capacitive or e-field switch technology, the Touch Dome LED Dome Light is reliable even when wet or wearing...
PERKO Figure No. 1263 Exterior Surface Mount Dome Light with Red & White Bulbs [1263DP1WHT, 1263001WHT, 0337012DP, 0337R12DP, 1263DP099A, 0024DP1, 0257DP4]
www.perko.com
This is for both red and white light but also in Perko catalog is just the white light. A little more money than some but well worth the $10 extra dollars. Bought mine thru Ebay and saved over catalog pricing.