I'm helping a friend replace her Sony Xplod Blaupunkt RPD 555 head unit with an Alpine CDA-9884. She's got a Ford Focus with some Sony Xplod adapter kit for the dash and I can't figure out how to remove it. I know there are keys that you need to slide into two holes, but we don't have those. Is there another way? Or do you think Best Buy or somewhere would do it for a fee?