Your "new find" looks very solid--is it a 3.0S?--and where are you located.
In addition to an all original 1973 with 71K miles in terrific condition albeit an Automatic--don't despair for the Auto. as have had major left leg surgery with permanent residual limitation--so it does make sense for easier driving in heavy traffic especially here in SoCal. Send me your e-mail address and I'll forward a few pics of mine.
Am also caretaker of one of the first E-9's (#16)that I heve been with me since February 1972--and the highest mileage E-9 on the planet but in remarkable condition throughout--an award winner--also a very nice 2002 and years back an M-1.
I'm the one who put up response to your question re used parts sources--HTH
here pics of mine i like to collect bmw's will be updating pics of other bmw's i own still have to add 530i and 3.0si 90 735il vw passat and mercedes 300td 84 next week
pics of 3.0si with white leather in there to if any one wants to see a car thats rare