How to find/replace a 2014-2021 Leer 180 rear door?

So I've got an 2008 Tundra with a 2014-2021 Leer 180 topper. It doesn't perfectly fit but it fits well enough for being only 100 dollars. It's missing the rear door/window and I was wondering if anyone knows where I can get a replacement? I've been looking but have had no luck. Any help would be appreciated!

 

I'm guessing that getting an actual glass replacement would be more than you paid for the cap itself unless you happen to get lucky enough to find somebody selling one but you could probably just cut one out of Plexi glass and easily drill the holes to attach to the struts and a couple little latches.

 

Thanks, It's been pretty hard to find one and I actually called Leer who quoted me 500 bucks. I'll probably end up getting some plexi glass like you said.