Some say '65/'66 Mustang seats are the same as '66/'67 Bronco seats, but not exactly. The Mustang driver's and passenger bottom frames are both set up for sliders. Only the Bronco driver's side frame is. The Bronco passenger side bottom frame tilts forward on two unequal length hinges and is arched in the back to sit as high as the driver's side. Also, the Mustang seat backs tilt forward in opposite directions for entry while the Bronco backs tilt the same way. The Mustang driver's side bottom frame and back are the same as the Bronco, just not so with the passenger side.