The speaker grill and glove box are painted the same color as the entire cab interior, i.e. PPG DBU/DBI #27467, the raised portions of the grill are a lighter more silver gray color. There are no numbers for that paint, you will have to wing it from here. I would shoot a sample panel with the base color and then try for a complementery color at the Duplicolor rack.
This is a well worn, but original glove box out of a '50 AD, is can be confusing which are the hills and which are the valleys, but trust me, the raised bars are the lighter color.
http://www.pbase.com/dennygraham/image/123004215/original Of course colors from the camera to the computer to the screen are not accutate but it does show the contrast.
Here’s an ashtray grill I was playing around with. The colors were just Duplicolor rattle cans, not that they were correct, I was simply experimenting mind you.
http://www.pbase.com/dennygraham/image/123004315 http://www.pbase.com/dennygraham/image/123004303/large Denny Graham
Sandwich, IL