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Download this Metra GMOS-01 Wiring Interface manual for free.
Owner's manuals have a variety of uses but one important use for this connect a car stereo and retain onstar factory door chimes and audible safety warnings in select gm vehicles manual is to lookup spare part numbers or find the correct name of a part ;)
Once you find the right name or part number then you can go back and lookup the spare parts that you need!
Got the manual? Now find your spare parts: Metra GMOS-01 Wiring Interface Parts at eBay
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