Re: 3 point seat belts. 75 blazer with top off.
Many race cars mount seatbelts to the roll cage. Of course that cage is built more solid than anything else in the car. It's part of the frame, and pretty much every part of the body can be ripped away and the driver will still be in the car.
If you mount to the roll bar it needs to be a solid roll bar, preferably attached to the frame. If you do a light roll over, and the roll bar folds into the back seat, it's going to pull that seat belt into you.
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