Search various Audi 90 parts, complete parts dispensers or helpful tips!

Hello dear Audi community! 4 years ago someone on my beloved 90s (2.0l 5-Cyl.) rushed on it and everyone told me it is almost impossible to fix it again (repair costs according to expert opinion less than 9,000€). I did not give it up and finally found someone who has shaped my baby’s beautiful butt again. Now, of course, after such a long time (despite continuous service time in dry garage) I have some problems before the tuv. The worst are completely rusty and collapsed gasoline pipes as well as rust on doors and fenders. Even after a long search for new or used lines I would not find anything to do with it. I would have had a company at my hand which makes me new special, costs only accordingly….. Since I need some other parts (doors, fenders, coolers & headlights), I have now thought that I would have to buy parts cheaper than my part donor. Now to my question: Has someone offered a 90’s for it (also with engine damage o.ä.) Or would find the necessary to buy all the fuel lines for the whole.