So what did you do to remove the rear brake line retainer bolt? I got them mounted and everything went great, but will have to figure out something on the rear retainer as I couldn't get anything on it.That is what I put on my 80. I used a lift and jack stands to hold slider close to where the sliders fit to the frame, on both sides. Chase out the 4 bolt hole threads on PS of frame where the brace comes underneath the CATS. Mine were rusty, but threads were good. The big U bolts have to be wiggled around the frame. Be careful not to lay underneath the sliders until they are loosely secured to the frame. Mine fit well without any grinding or bending. Heavy duty. Good luck, take your time.