These are shipped as regular production accessories (RPA) they are not installed at the plant. When the vehicle's VIN is scanned at the end of assembly, this triggers GM Parts to ship whatever RPA's were ordered for the vehicle to the dealer. The dealer then installs when the vehicle is received.
Mine fit perfectly. A lot depends on the technician, and if he really cares.
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Black Sheep Hummer Squadron
(ME TOO)
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