Google 'Partzilla', 'CMSNL' and 'Megazip.net' Those parts sites will give you a good indication of what is still available new.
If you want to know what other hondas use the same parts then get the Zedder cross reference program for Honda from here
http://www.zedder.com/index.htmIts a 35 yrs old bike so just expect to replace all bearings, seals, cables, gaskets, hydraulic brake parts, forks rebuilt, shock rebuilt or replaced etc. Paint, replate, polish parts etc. Its all pretty much straight forward. Most importantly get a correct workshop manual for your bike, preferably genuine plus an aftermarket one.