Thanks for the information so far. I do have an air brush, I should have mentioned that.
I see the bronze in the silver which is what is telling me I will not find a color 'off the shelf'. I probably need to paint the entire roof one color that is close to what is was originally and call it done. I can start with painting some other plastic parts with a 'silver with brass' mixture and see how close I can get it.
I checked with GGD and due to age they do not have spare parts or even something close to start from. I then decided to use the 3D printer to create the hollow cylinder and hopefully paint to match.