Replacement Lock Cylinders
WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The lock cylinder keyway is designed so that other model keys will not enter a current model lock cylinder. New lock cylinders are available from the service parts warehouses without tumblers and springs. The tumblers and springs are also available and must be assembled into the lock cylinder according to the mechanical key code.