Thanks for the pictures!
I took a look at your light, SAE-A-P2-76, and I was able to find the Replacement Amber Lens for MC44 or MCL44 Series Side Marker or Clearance Trailer Lights # A44AB which appears to be a match for your 2005 Casita Spirit Travel Trailer.
This light measures 4" long, 1-1/2" tall, and is 7/8" deep. view full answer...
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