GMC 2001 Sierra 1500 Pickup Owner's Manual page 156

Tonneau Cover (If Equipped)
1. To remove, unsnap the
cover. Roll up and stow
using the buckle and the
strap located at the front
of the box.
A. Back rail
B. Side rail
C. Rear bow
Remove the tonneau cover from the notch in the front
rail from the driver's side of the vehicle.
D. Center bow
E. Front bow
F. Front rail
2-73