I never liked the greenhouse redesign on these. Apparently, they had to get rid of the pillarless 2-door hardtop design - shoulder harness mounting points, roll-over crush standards, who knows.......
Interesting to note that it took 30+ years for Chevrolet to figure out they could reinforce the seat and mountings to allow belts to be attached to the seat, or built in.
Proof you could build a true hardtop coupe with 3-point seat belts. http://www.ebay.com/itm/1974-Chevro...ca-/252688831627?_trksid=p2141725.m3641.l6368