Can anyone recommend 3 point seat belt config for a 68 Barracuda?

Hi All
We are restoring a 1968 Barracuda and need some advise from anyone who has replaced the existing lap seat belts that came standard with the 68 Barracuda, with something that connects both at the floor as well as on the roof.

I think its referred to as a 3 point lap sash setup.

Is anyone aware of anyone manufacturing something to fit a 68 Barracuda?

Thanks in advance for everyones advice
Steve