1969 Dart Swinger bench seat belt Question

There isn't any shoulder belts but that would explain it. They must have left the shoulder belts out when the headliner was redone. I didn't realize the 1969 also had shoulder belts??? My 70 did. Is it normal in the back seat to have the left and right passenger to have the mail end over about 10 inches from the end of the seat. Seems a little goofy as you have to sit almost on top of it. It must be where they decided to fastener the belts. Unsure why? Thanks.