They do not bolt where the factory bench seat bolts to on the floor. On a factory bucket seat car there are reinforcement bracket on the inside and two other holes on the outside inside of the hump that the bench seat bolts too, hope you tried them there, I can't tell if that is where you bolted them too. On my Hemi Dart there is plenty of room to the headliner, of course I am just 5'-9"...