Not familiar with that type of light fixture, but on most of ours in the monaco they were a 1/4 turn twist...(but some were fused to the ceiling material the halogens got so hot and softened the ceiling material, so used a thin tool to separate and then twist)
We LOVE the LED's - Hardest thing was finding the right 'color' we liked....
I bought a few of different color temps so we could compare... ended up with warm white 3000K as our favorite...
you are correct, they are unbelievably cooler and very little draw!
(in the pic) are some we got for OURS, not dimmable and just trimmed the prongs a bit shorter to go in easier...
they've lasted a good while and I've been known to leave them on at the storage lot for a day or two - EZ to do on mine as the opposing slides hide the fixtures and I'm forgetful
oh, and I liked them so much I ordered led backup lights for my jeep and rv