Nial thank you for the update. I will look into this and let you know what I find.
Midgetman - the HANS has never been tested with OEM 3-point belts. The fact that it uses friction from the double shoulder belts indicates it may not provide much benefit. However there is one FHR that has been tested with 3-point belts and shown to provide a big improvement over no FHR. This is a specific model of the Simpson Hybrid. As you may know, these "backpack style" FHRs strap to the body to help locate the device (shoulder belts are also used). You can find this "Hybrid 3-Point Belt Approved" here:
http://simpsonraceproducts.com/hybri...belt-approved/
NOTE: Simpson’s top concern is your safety. While on a racetrack for the BEST protection we suggest a Full Containment Cockpit System that includes a Full Containment Seat, Snell rated Helmet, FIA or SFI approved Frontal Head Restraint and a 7-point seatbelt harness system.
Thank you. GM