I need advice. Cuuurently E34 535 and 2002 owner and now I am looking at a one owner 73 bavaria with 80k original miles. car has been sitting for 7 or 8 years and driven only 400 miles in that time. usual rust on exterior shell. i.e. wheel arches. I think the color is bristol, but faded. the big question is how much do I offer the guy? Please email with response.