Dog Collars John, the leather strap variety, early alternative to the 'hood' pins that seem to fail, even last weekend. ' Must ' be FIA legal as Bruce McLarens Ford GT used several to hold the rear clip in place at Le Mans.
Seat belts, jury is out on them, been in 4 rollovers myself, two without belts which would have been ugly if the belt was worn & the two with belts, one which wouldnt have hurt at 10mph in a blizzard, the other, I dont know. Some of the crap I get asked to fix should have had a sign * I am a dog, drive me & I might bite!*.
In spite of the photo I did have belts on in the Imp, without them I might have been tempted to bail out when the brake pedal hit the floor about 200 meters before ' that ' pic.