Hi I just bought a rear deck spoiler from classicgarageorders@yahoo.com (classic garage)and a front air dam from topend@racetep.com. I just bought my 1977 BMW 530i exactly for the reasons you mentioned. Many of them are rust free solid cars, no catylic converters, are 25 years old (no emmisions)handle well, respond great to modest tweaks and CHEAP. Most of all the engine bays are large and the bimmer engines heavy so a transplant of a aluminium block LS1 actually lightens the car. Replace the generally tired interior and you have a killer machine that handles as well as knocks you back in the seat for under $10 grand.