Where are the Seatbelt Mounting Points in 68 BArracuda Fast Back

British requirements on shoulder belts made them a requirement to be retroactively fitted to all passenger cars going back to 1965. If i had to guess every new 67 going to GB had to have shoulder belts including convertibles. Attaching the shoulder belts at the rear seatbelt anchors doesnt seem to make any sense, i would have to see an illustration.