The headrests were made from marine ply and mounted to the GD bracket, which in turn is drill and tapped (M5) to the rear leg on each Roll Hoop. The trim of the headset matches that of the seats and stitching throughout the interior of the cockpit.
Needless to say, it is easier to drill and fit these prior to mounting the Roll Hoops to the car given the angle of the rear leg . M5 button head bolts were utilised to make a smooth surface.
The next task is to finally fit the Roll Hoops to the chassis with M12 x45 bolts and grommets.