Not a Camaro (or first gen) part but I know there are a lot of Firebird guys that check in on this site. A friend of mine wanted me to list an original GM 70-77 Firebird radio delete plate for him on eBay. It's new and was never installed in a car. The part number on the part is 479381(?) He doesn't have the original package. Any idea what should I list it at so he gets a fair price? I don't know what they are worth.

Thanks