Your photos sure look Gray more than Green to me. I don't think Chevy would have used Green of any shade on a truck interior, as it would look off with various exterior colors. A neutral Gray would match just about anything. Why don't you have a paint shop mix you a little bit of the Silver Gray with the code you have and see how well it matches (It won't exactly match the old paint, but will be close, especially in areas that are protected from weather and sunshine.)
Welcome to the Stovebolt Forums.
Nice looking truck (from what I can see of it in your pics).
You should post an introduction in the Welcome Center and show us some overall pics of your project.
