Hi David!
I'm still cataloging what I have. I *do* have extra gauge bezels... not sure if they are "good" though. I'll be back over there tomorrow and I'll take a look. Not sure about the dash light and a "no" on the mirror and seat frame. Are you talking about the base that covers the fuel tank? or the actual seat parts themselves?
I have an extra door latch (the cab side) but I'm not sure it's any good. It still has the vertical cab shell piece attached to it.
A couple of things I need ...

Headlight lenses and trim rings
Windshield upper part hardware
Question:
What do the trim pieces look like that cover the seams between the cab sheet metal parts?
Nice to meet you!
Got pics of your project?