This most forward cross sill fits: 1999-2006 Chevrolet Silverado fleetside 1999-2006 GMC Sierra fleetside Measurement 63 3/4 x 3 3/4 x 2 Weight 8.8lb This is the bed floor cross sill that is the closest to the front bed panel- it is the one in front of the sill used to secure the bed to the frame
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