So I thought i was going to have to lean on the Stovebolt collective to get my heater put back together, but as it turns out I had taken a picture of the defrost flapper before disassembling it. Found it among my gazillion pictures I took during the project process.YAY for me!!

So you guys are off the hook.

Here's that pic, and another of the parts before putting them back together (I would have gotten it wrong.) Maybe this will help someone in the same situation.