This 4pc cross sill kit fits: 1999-2006 Chevrolet Silverado fleetside with 5.5' or 6' bed 1999-2006 GMC Sierra fleetside with 5.5' or 6' bed Measurement 64 3/4 x 9 x 4 1/2 Weight 36.6 lbs This is all of the cross sills, except the rear cross sill under the tailgate, for a 5.5' or 6' bed
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