I own an '89 Silverado K2500 with the factory digital AM/FM radio right up next to the gauge cluster. I already know that there aren't any aftermarket radios that will fit in this spot. My question is, though, did GM ever make a blank panel for this spot for fleet vehicles or W/T trucks that were ordered without a radio installed? And if they did, what is the part number? Can I still order one? I'd like to install a Secret Audio system, but I would need a blank surface to mount the system controls to. Thanks in advance.