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