the pieces that attach seat belts and race harness are made out of what!lol ad im sure the fibreglass that most race seats are made of isnt going to be as strong as the sheet steel now is it.the rails we make for the racecars are alloy and i have seen it handle hitting the wall at 200km/h.besides the fact that the retainers the seat bolts into on a standard car are very thin sheet.
mick
p.s i took a pic but it 400k so i can email it