Did you try searching the salvage yards on Car-Part.com?
https://www.car-part.com/
The US yards usually want too much for parts, but I have found a few things on there for other vehicles that I couldn't find used anywhere else.
Also, you'll have to pick up the phone and call the yard if you find something you want listed. In my experience, junk yard people don't respond to email at all, even when they specifically tell you to email them. I don't think they know how email works.