Look under "original radio speaker..." topic in the Lounge (on down a ways now, try page 2 of the lounge). Some folks answered this question for me there, and I believe they are pretty much correct.
I doubt that the middle raised ribs were stainless or chromed on any of the trucks. I doubt this because the entire radio speaker grille would have had to have been stainless (or chrome) as well as the glovebox door. I've not heard of the radio speaker grill itself being produced that way, although its upper and lower strips certainly were, as was the glovebox door.
But, I could be wrong!
