99-06 SILV/SIERRA +07 CLASSIC FLEETSIDE SECOND CROSS SILL 64 1/8 X 3 1/2 X 2 WITH BED MOUNTING NUTS SPACED 47 5/16 APART

This second cross sill fits:
1999-2006 Chevrolet Silverado fleetside 1999-2006 GMC Sierra fleetside
Measurement 63 3/4 x 3 3/4 x 2 1/4
Weight 8.8lb  This is the bed floor cross sill that is the second back from the front bed panel- it is the forward sill used to secure the bed to the frame