Most of the car audio places will sell an adaptor or can get one. I can't remember which brands they work with but the audio places will have a list. I pretty sure they work with Kenwood, Alpine and a couple more. Definatly don't work with Panasonic
That is true. I have the PAC SWI-ALP which stands for steering wheel interface for Alpine head units. Mine works like a charm. I believe it does a couple of other brands, but I don't remember off the top of my head. I'd try to get one that's specifically made for the brand before I went with the infrared one.
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