my Poor little red RXS 100, parts?

My little old RXS 100 is in a bit of a state, my first one the 1985 one was red but then the i found that in several places only paint was keeping fuel from spilling ourt of the tank, so i replaced it with a blue one fromthe same guy who gave me the red one, so my red bike turned blue, but now, i have the bike the blue parts came off and thi sone now has the tatered red parts on it, but its in a sorry state, so what im wondering is are there any places to get replacement parts for older bikes, caus im planning to restore the one, and am in search of

Tank, Exaust, and down pipe, foot pegs, Seat, and probably some wheels,

now ofcourse thisd is my wish list and some of the current parts are salvagable but any information on where to find other parts greatly apreciated