New 3 point seat belts

Can you post a pic of the set up in your wife's car? Mine is a 67 so I don't think there is anything that is on the roof (I'd have to pull the headliner off to see).
Without pulling the headliner... If the coat hook is directly above the line where side glasses meet, there is no belt anchor hidden by the headliner. They put that belt anchor almost exactly were the coat hook was, Moved the coat hook about 4 inches rearward.