Leisure LED 12V RV Ceiling Dome Light RV Interior Lighting for Trailer Camper with Switch, Single Dome 300LM (Natural White 4000-4500K, 1-Pack)
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On each lite, it appears to be a 20 or 22 gage pig tail; I used 18 for power looks on all five lites.
I never had to replace one, and my camper with the fittings was sold. These LED bulbs and fixtures appear to be widely available at Camping World. It's worth a shot.