99-06 SILV/SIERRA + 07 CLASSIC CROSS SILL IMMEDIATELY BEHIND WHEEL TUBS 64 1/8 X 3 1/2 X 2 WITH BED MOUNTING NUTS SPACED 39 APART

This rearward cross sill fits:
1999-2006 Chevrolet Silverado fleetside 1999-2006 GMC Sierra fleetside
Measurement 63 3/4 x 2 1/4 x 3 3/4
Weight 6.4lb     This is the bed floor cross sill that is immediately behind the wheel tubs- this is NOT the rear cross sill under the tailgate. It is the sill used to secure the bed to the frame in the rear