Shoulder Belt retainer on '68 Road Runner

My '68 RR (build date 22 Mar 68) has the shoulder belts stored above the drivers and passengers doors. There is a metal receiver for the seat belt buckle as part of the visor attachment. I believe originally there was an elastic strap with a snap to store the folded part of the belt above the doors.. Anyone have a photo of it or maybe it's reproduced somewhere.
Any thoughts?

Thanks
Frank

Yup, narrow elastic strap with a snap.
Barely visible in this photo of my '68, which is also a headrest car (verified on BS).
I would guess that someone who restores seat belts, or a good upholstery shop, could re-do them.