AT8M5 wrote:
Just like the NA e28M5, black was the only color choice...
Karl
WRONG!
Starting with the 1976 production,(#2070) the CV's were available in:
black
white
blue metallic
firethorn red metallic
mahogany metallic
dark green metallic
buckskin
medium saddle metallic
medium orange
I owned a 1975 Cosworth Vega. I was also the Northern Caluifornia Regional Director for the Cosworth Vega Owner's Association (CVOA). The organization is still around today:
http://www.cosworthvega.com/

This picture was taken by a fellow Cosworth owner, living near San Luis Obispo, while I was an engineering student at Cal Poly. The year was 1980.
I put Goodyear Wingfoot's and Koni Red shocks on it, as well as a "test pipe", a front spoiler, and some dark acrylic headlight covers I made in a plastics lab at school.
I never had rust issues (California car since new). Every engine was hand signed by the guy who built it! The valves adjusted with shims (similar to the s38) and I did my own adjustments. The Chevrolet Power Catalog listed a HD block, high compression pistons, performance cams, and a dry sump oiling system. I was also fortunate to be friends with the owner of "Performance Dynamics" in Sacramento, one of 3 national Cosworth Vega service shops. We had national "round-ups" and social gatherings. We were invited to the Monterey Historics one year when the featured marque was Chevrolet, and we got 3 laps around Laguna Seca!
A fun car, and not "just a Vega" (I owned 5 Vegas over the years, but only one Cosworth). Because each one had the famous "numbered dash plaque", they were collectible from the beginning. They were never worth alot, because there were several kept "mint, unused, undriven".
I sold it to buy my second BMW, first e28.