I'm not sure of '68, but my '71 convertible came with FRONT shoulder belts per the build sheet. I'm guessing when the top was replaced by PO the shop pulled the belts out. I still have the short end at the front seat and haven't yet been able to find any for sale.
Kurt Heinrich 1971 Cutlass Supreme SX Convertible OCA# 30442 Right... for the rear seat passengers. No place to anchor a belt for front seat. If it were on the roof, good luck folding the top down. :-)
