Bought these for my 11th Durango crew. The top of the shock only had 2 flat sides and could not be installed. On stock shocks you use a through ratchet and another socket to loosen the bolt, you can't do that with them. I took them to my mechanic and he put them on and I don't know how and he didn't tell me (probably to get the money flowing) but they are awful. The rear end of my Durango now bounces all over the place like the shocks blew out. They will be removed and I will be returning the leaky factories until I get another brand.