I replaced every internal fixture, single and double bulb, with nearly identical equivalent permanent sealed fixture from Amazon. Used same screw holes for the most part even! About $8 per single, $12 per double. I replaced the 2 singles in the bathroom with doubles. These fixtures are 1/4" lower profile- hug the ceiling- than originals, too, and I replaced the midship lampshade lights with singles which fit perfectly. If i were smarter I'd have pics already saved to post. These fixtures have all the LED "chips", called SMD's, pointing downward so the light is excellent, not diffused or redirected like the cylindrically shaped 1156 bulbs are. Took a bit of research to find the correct "color temperature" (Kelvin) so as to not be too yellow (3000K range or lower) or too start white with blue tint (5500K or higher). Description on Amazon here: "Lumitronics RV Double 12V LED Dome Light with 3-Way Switch and Removable Lenses". I also installed 2 of these on the underside of the dropdown sleeping bunk to illuminate the dining table and booths (I swapped the front jacknife sofa sleeper and the entire dinette locations):" Facon 8-Inch LED RV Panel Light, Dimmable Surface Mount with Touch On/Off Switch, 2 Color Temp 3000K / 4000K, 12V DC Interior Light for RV Motorhome Camper Caravan Marine". All took literally 5 minutes per fixture to swap with screwgun and wire nuts!