I replaced my RV bulbs with the same type you have which is a 921 or 906 equivelent LED Bulb. Be sure to check you lumens if you want a bright bulb. I went with the 13-5050 SMD type warm white bulb. The 13 refers to how many SMD's are on the bulb. The 5050 is the size of the SMD's on the led bulb. Led bulbs come in all type of colors but warm white best resembles the original bulbs the come in trailers. The 13-5050 wedge type led bulb is about 180 to 210 in lumens. Very bright and almost close to your original RV bulb. Its good to read by as well. You can get these on Ebay for about $2.00 a piece. I highly recommend them. At this price you can always get extras.