I would say your best bet would be CraigsList or AutoTrader... As far as parts I couldn't tell you but I have restored a few 60s and 70s Mercs and they have many reproduction parts.... I am sure there are some for BMW I'd search Google.
BMW Owners Club. "Good shape" probably rules out most of the 300quid ones in Autotrader. PS Understand were you are coming from - I got an E34 5series for the same reason
BMW Owners Club. "Good shape" probably rules out most of the 300quid ones in Autotrader. PS Understand were you are coming from - I got an E34 5series for the same reason