2008 Chevy Silverado 4X4 Clamp Shim Brackets
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10. Because the bed of the Silverado is not actually square, PE supplies these two-piece aluminum clamp shims, which are slid onto the guide rails to ensure that the guide rails remain the same distance from each other for the length of the bed. If they are not square, the cover will not be able to operate correctly. View Related Article
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