Buckle up. Check out some video of what can happen in a roll over, while seated next to a burly passenger. Or if you will, imagine the difference between being tied to a seat during the aforementioned total destruction. Opposed to having the laws of nature determine what parts of the car or world contact your body. By the way, in 1951 a miracle, and a crate of eggs saved my life in a Model A. Without the crate of eggs, my head would have been crushed.
I've had no time for my avatar in the last 15 years (over the road tractor trailer means home to rest a couple times during the month). The rear is ready for a rebuild and we began to think twice about the glass. When it rolls again it will have safety glass and.... thanks to these threads seat belts will be anchored secure and safe regardless of authenticity. Henry would approve.
To quote Mr. hardtimes, "50% of something beats heck out of 100% of nothing".