When we picked up our new to us 2002 Classic 30 I didn't think anything was unusual about the marker lights, although perhaps I should have. The lights were the generic rectangular lights with white plastic bases and colored red or amber lenses that I have on my boat trailer.
While sitting outside during the Cajun Country Caravan I noticed a teardrop-shaped outline around and under the lights, indicating that at one time the lights were changed. When I looked around at the other trailers at the campsite, I discovered that they all had teardrop shaped lights. I asked someone where I might find OEM replacement lights and was referred to Vintage Trailer Supply. The only lights I could find there had a mounting flange with screw holes on the outside, but the original lights on my trailer showed no evidence of being screwed down so I assume that any mounting screw holes are under the replacement lights.
I'm not sure I want to do this, but should I decide to go back to OEM lights, are there sources other than Airstream?
UPDATE: Google is your friend... I found both on Intermountain Airstream Supply.
This looks like what is on my trailer:
and this looks like what I saw on other trailers at the rally
I guess someone changed the lights and put the rectangular ones on. I'm less interested in replacing now that I find that they probably are Airstream OEM rather than e-Bay specials.