67 Shoulder Belt Roof Anchor

[ertoys]

There should be a sleve that is machined down to allow the belt mount to swivel will find a pic and post
paul67

I agree, if you look at the factory bolts they are as described above.

The sleeve (the machined down surface) actually meets the floor mounting point and stops the bolt from actually contacting the face surface of the metal belt base.

In turn this allows the belt base to swivel.