Seat belts missing

[WDA]

When I purchased my 1976 Avanti II the attachments for the front seat belts were completely missing. The carpet has been recently replaced and I suspect the PO just forgot to reinstall the floor mounted attachments for the front belts. That was likely 3-4 PO ago.....The inertial reels are in place in the rear seat side area as are the attaching points on the door pillar. I purchased some new 1976 Camaro belts, but I dont think they will attach quite correctly. Does anyone have photos of where the seat belt attaching points are in the front and what they look like?? Is there some GM model that has better seat belt  attaching style and fitment?

I can't figure where the attaching point is on the outer side near the door jam.

I see he inner side hole is there but is 90 degrees off of the GM attaching point. Do you need a 90 degree adapter? Any idea of the hole thread size/bolt sizes?

 

Help!