Realizing that these are made to fit newer model CJ's they do work on 78 models also. Had to pry the control cable bracket out a little and slide it in place. After a couple of tries it snapped itself in place just like it was made for it. I didn't use any screws to secure it and it sits in place good anyway. I'm glad I bought it, it helps to blow the hot air out into the cabin instead of just the floor.