1967 Mustang Coupe Seatbelt replacement options

I plan to install 3pts. in my '67 Coupe, I like this co's offerings since they offer a 3pt. retractable in my red with 60's style buckles that aren't plastic like a lot of others I've seen and they're affordable ~120pr. vs.>$200 for others I've see, especially those offered by Mustang parts suppliers. I'm going to have them add the 8" shoulder belt extensions to put the belt closer to my shoulder height and avoid neck rubbing.
BEAMS Chrome Lift Lever Retractable Lap & Shoulder Belt

Belts should not pull/be mounted below your shoulder height or you could suffer spine compression in an accident.
Main
Jon

To be safe I believe you'd have to properly install a rollbar to hook the 4pts. to. If you read that SFI article Mainyou'll see that mounting them to the floor behind your back will cause spine compression on impact as stated. Anything greater than a 5* downward mount is bad. I don't know how else you would mount a 4 point other than to a rollbar.
Jon

mustangls1 said:

I don't know why but i feel like i can't trust a 3 point because I'm not sure if it would keep my brain off of the dash

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Any particular reasoning for this thought? In a 3pt. the top belt goes across your chest/over shoulder just as every new car belt does and it's inertial reel activated just as a 'new mustang' belt is. You could probably retrofit a foxbody belt, maybe the SN95's too? depends if they were mounted into the C pillar or externally bolted I would imagine.
Jon