I have a radio delete plate with mounting clips that I have been told fits these 60's trucks. I put a tape measure beside the delete plate in the pictures for reference to exact size.
It is painted as you can see from pictures and doesn't have any major rust issues - what you may not be able to see is the pencil writing on the face of it.
Person who had it in their truck must not have ever had note paper when they needed it!

I'm selling this for $48 shipped to your door.