struts; however, since there is an upper control arm they are actually coilover shocks. Brakes were a vented rotor / single-piston caliper with Sport model Thunderbirds receiving a larger diameter rotor. The rear suspension consisted of upper and lower control arms with coil spring and shock. Varying sway bar diameters were used among the different models of Cougar and Thunderbird. All MN12 cars shipped from the factory with a 5 x 4.25" (5x108mm) lugnut bolt pattern. References MN12