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...
The # AKEBRK-35-SA aren't specific to any particular year, make and model trailer.
They're designed for a 10 x 2-1/4 brake drum that's typically used with a 3500 lb axle. From my research, it looks like the 2013 Casita Freedom Deluxe used a 3500 lb axle, so the # AKEBRK-35-SA brake assemblies should work fine for you. You can confirm this by measuring the inside diameter and depth of your brake drums.
You'll also want to make sure your current brake mounting flanges have 4 holes that... view full answer...