I ended up purchasing the parts catalog from a super sketch site but it's been a goldmine of info. Being able to lookup part numbers and ordering from
https://s1partscenter.com/ (they tend to be the cheapest online) has been helpful as I'm trying to put a 2000 FG639 back on the road.
The parts catalog I have includes FG439, FG639, FG649, FG84D and FGB72. Anyone needs helping looking stuff up, happy to help.