I fried a few brain cells trying to find them thinking, surely the vendors will call it by its name: Retainer, door curtain, or use the Willys part number: 681373 (L), 681374 (R)
Nope.
Then I dropped a few search words and found a very familiar post right here on this forum:
https://www.cj3apage.com/Forum/index.php?topic=5547.0It appears KW DOES have them, but leave it to the experts to change the name and the part number (yeah, I forgot I posted this).
Originally, these were spot welded to the inside of the frame.
Measuring my original w/s frame, the retainers are 20.5" from top to bottom. That initially makes sense since the 3A w/s frame is taller than the 3B frame. I would think cutting them to size should work just fine. Just make sure the top hinge is at the correct height so the door frames sit like they should.