1. Remove the rear fender liners

2. Using a screwdriver, remove the two clips holding the lower bumper mount to the amplifier...

3. ...and remove the pistons.

4. Unscrew one screw on the right and left sides of the front fastening of the rear bumper to the wing.

5. Remove the rear bumper by disengaging the fasteners securing the bumper to the amplifier.

Note: This is how the fasteners that secure the rear bumper to the amplifier are located.
6. Install the parts in the reverse order of removal.
(The original article is on the website: «chevyman.ru»)
