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I had an issue with the buttons on the stock BOSE head unit in my '03 vert without the rear mounted 12 dics CD changer. I bought a used unit locally from a 'guy' at a fair price and then put it on a shelf. I finally got around to installing this weekend and noticed that the one I bought had a different....or actually lack of....connector.
Below is file pic from the parts section here on CF.
Actually, I just relooked at the second pic I posted, and it may not be exactly like the unit I bought. The unit I bought had a 'hollow' area under the main connector. Also, I don't know for sure how many pins are in the top connector....I'll have to look again when I get home.
I was riding with a friend the other day in his Chevy S-10 pickup and his has the same type head unit we have, but he does not have a Bose sound system. Maybe the unit you bought is not for a C5.
im not exaclty sure in ur case... but its a parts bin GM radio... some cars had cd changers, and some cars had steering wheel controls, could be for one of those cars