This mid cross sill fits: 1999-2006 Chevrolet Silverado fleetside 1999-2006 GMC Sierra fleetside Measurement 49 x 2 3/4 x 3 3/4 Weight 6.4lb This is the bed floor cross sill that is between the wheel tubs- a 5.5' bed and 6' bed use one of these and the longbed uses two
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