I used your ordering guide to get one to fit my 2006 K2000HD. According to the packing list, the rear ones were for the C2500HD. It turns out the tails are the same on both trucks, so no problem. Nice looking dampers. It was difficult to get the rear ones into the top hangers until I opened up the mounts a bit. Then EZ PZ. All the work will be easier if you watch the YouTube video first. Love that doesn't take the wheel off to get the job done. The body rose six or eight inches so I didn't have to compress the shock as much. The fourth blow lasted only ten minutes. The first three took a little longer. The old right rear damper was completely dead, the piston can be moved with two fingers.