Did 68 Darts come with shoulder belts

A saw a pair of shoulder belts on ebay listed for a 68 Dodge Dart.

It's been 30 years since I had my original GTS, so I cant remember if it had shoulder belts or not. The 68 GTS that I recently bought only has lap belts, and I dont see any place that should belts could have been mounted.

Were shoulder belts available on 68 Darts?