It is a lot... when I scored mine from @TRAIL TAILOR I was trilled, but sat on them for a couple of years (if not more)....I restored them best I could..., but really other than surface rust these were in great shape and even better once i finished installing them.....
I just dread the moment i'll have to replace the weatherstripping...
This website has some in stock but yeah the price is prohibitive at best... @AussieHJ6X i say this is the best you will get at getting spare parts..... I looked up Amayama when i was installing mine, and they did have some spare parts still available... don't know about now days....