I installed these:
10x Red Amber camper Trailer RV Light 6LED CLEARANCE 4" x 2"Side Marker Assembly | eBay
Most likely yours use the screw posts for power. The new LED one's have a pig tail so you will have to cut and crimp on the new wires. My '96, the rear was wired differently than the front...rears all had an access hole under the lamp so you could pull out the wires cut & crimp. The front had no access and has a wire running behind the wall which is attached to each light base bolt. On the front's I had to crimp on ring terminals which then slipped over the bolt before spinning on the nut. DO NOT LET THE BOLT SPIN WHEN REMOVING OR ATTACHING THE NUT or you might break the inaccessible wire. I grabbed the end with vise grips on the rusty one's, then cut off the bolt before trying to spin the nut off the end(see below).
One more thing, the LED's are a lower profile, so on both front and back I had cut off about 3/8ths from each bolt or the lens will not fit. I used a Dremel with a cut-off wheel.