I don’t know any links for NOS parts other than maybe Reverb or eBay but
Frets On The Net might be able to help you with some of that stuff. Cutting a new nut is not a big job for a competent tech either, that can be done pretty easily.
The neck tilt is kinda funny - on my earlier (‘79 and ‘80) model T-40s it hasn’t been all that necessary to mess with it, but on my 1982 it was absolutely impossible to get reasonable action without spending time getting that dialed in. I wonder if they changed the neck pocket depth on those later ones - I’ve never measured to compare unfortunately.