Need Help with Color Change

[PortraitPro]

I need to know if anyone can do a quick color change for me. The two-tone silver/black Torino, I'd like the silver color changed to the dark green color of my car, and black areas changed to a charcoal gray color (any charcoal gray will work, just don't want black may play around with lighter grays).

I like the two-tone scheme on the first car but I don't want to go silver and want to stick with the stock dark metallic green since it'll be easier and less expensive than a complete color change.