There certainly were shoulder belts offered in all 1967 Chevrolets as an option. That doesn't mean they're common. Anyway, for convertible models the outboard belt is anchored 'behind the rear quarter inner panel', to quote the '1967 Features and Specifications manual'. When I get home I can look up in my 1967 Fisher Body Manual the placement of the belts. It seems to me that there were clips on the upper trim panel adjacent to the back seat.
I've never seen a stock shoulder belt equipped 1967 convertible, but the belts were offered.
Page 15-61 of the 67 Fisher Body manual has a detail showing this for "all styles". You remove an existing convert. top hinge upper bolt and put it through the belt hole and secure it. The belt needs a plastic sleeve to pass by the plastic trim without scuffing.
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