Our Airstream came to us with the exterior running lights already wired (a mixed blessing: they don’t look as cool as I’d like, but I didn’t have to do anything with the lights to drive it home).  Some (not all) of the lights had been replaced with LED, but the housing on those new LED lights doesn’t have a gasket at the base; rather, it looks like it’s missing a gasket around the base of the light.

Evidently this is how they are supposed to look, but I wish it looked a little more integrated.  I’m going to leave them as-is for now (they work and they don’t let water in), but maybe someday I’ll make them a little more “fancy.”