When I bought my Coupe in 1980, it was very similar in color to that 75 CSi. It had been repainted because someone had put a long, deep key stripe in it for taking two parking spaces. I was told the shop painted it with a Chevy color. The owner of the Coupe certainly noticed the change and objected. He was asked to go ahead and take it and if he did not like it they would repaint it. He said the color grew on him and he didn't take it back.
They did not paint the jams, under the hood, trunk or anyplace else that could not be seen from the outside. I didn't care for the color very much and when I saw the unpainted Baikal, I knew it had to go back to original if I bought it and that became my negotiation argument. It just did not look like a BMW color.