Welcome to the forum. I can't say for sure what, if any differences in frames might exist between the 80 and 800 models. The bodies are nearly identical, aside from some minor cosmetic changes. The biggest thing would be the body mounts. If you've got both scouts handy, you could find out for yourself by taking measurements of each and comparing.
As for loose body parts, you're best bet is pick-n-pulls and private party donor rigs local to your region. Beyond that, it comes down to perusing the classifieds on this and other binder interest forums and paying through the nose to have bulky items shipped great distances. Its all a matter of how desperate you are for the parts.