Alpine CD changer interface for stock stereos

[99-2door]

I have a Alpine CD Changer interface Adapter for GM cars. Model KCE-202B. I know this works with the Theftlock style stereos from 95-02. It may work for other style GM stereos with the 9-pin connecter and a AUX button too. Makes your stock stereo control an Alpine cd changer with m-bus type cable. I am including a Alpine changer cable that is about 15' long. These units are pretty expensive new, around $100. I will take $30 for the interface and cable. PM me if interested. Thanks

[99-2door]

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[6Burgh]

Know if this would work on a '04 GMC Sierra stereo? It is a single CD/cassette. I want to add XM radio eventually. But would like to hook up my old CHM-S600 if it would work. I have looked across the net and haven't found any good info if it would or not.