Here's a couple photos showing a radio detail and mount. This would be typical for a CSX Cobra but I don't know if it would apply to a COX or COB car or not. Just so you know.
Most common radio chassis (though there were a couple others) would be a Motorola 324TC.
On the antenna, look for a "PM-300". I have some photos somewhere showing an antenna but can't find them at the moment. I'll post when I run across them. That's what happens when you have too many photos!
Larry