One way to find out is look under your seat and see if there are any connectors just laying under there. Sometimes, on some vehicles, GM produces one harness and leaves the connectors not used. I would have to access the part system and see if there are two different cross body harness available, and if so, find out what the differences are between the two.
I'll send myself a note to remember to look at the parts catalog tomorrow at work.
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Black Sheep Hummer Squadron
(ME TOO)
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