Chalk this one up in the unnecessary upgrades category, but the chintzy license plate light and mount on modern Airstreams has always bothered me.
I looked into swapping out for a vintage reproduction mount and while I like the all stainless steel construction, I wasn’t crazy about the mounting on it either.
So, I ended up with a separate light and plate mount that I’m pretty happy with. The mount holes for the light line up almost exactly with the original (after some very minor slotting of the holes on the new light). I used some 1/8” foam as a mounting gasket. The plate mount is actually meant to be for a BMW (so uses metric plate mount screws), but is very simple and pretty well made with a 4-hole mount for the plate.
If anyone is interested, here’s the parts list:
HEAVY DUTY LICENSE PLATE 6 LED LIGHT BOAT TRAILER RV TRUCK ATV - CHROME - QTY 2
https://www.amazon.com/dp/B07L45WK3C..._N0uADbT2PRZ06
JoyTutus Fits BMW Rear License Plate Bracket Frame Mount Tag Holder for 1 to 6 Series
https://www.amazon.com/dp/B07C7YZ6SK..._n1uADb1C75KS2
Tokept Polish White Stainless Steel License Plate Frame with 4 Holes(Pack of 2)
https://www.amazon.com/dp/B01IF0Y2MS..._61uADbQTC7MA8