Rear Upper Shock Mount Passenger Side 04-12 Chevy Colorado and GMC Canyon Rust Buster FrameworksAnother weak spot on 1st Gen Chevrolet Colorado and GMC Canyons are the rear shock mounts. This area of your truck takes the brunt of all the nasty road debris your tires kick up. Over time, this will start to destroy where your shock mount attaches to the frame and crossmember. A disaster waiting to happen if you off road or tow with your Colorado or Canyon. Of course, your Brother in Arms, Rust Buster has you covered. Introducing the Rear Upper