Sorry, man. This was awhile back and I took no pictures of it.
In a 73 Duster, I cut a hole in the inner structure right here:
Then attached the stock 74-76 retractor like you see in the above photo. In a 4 door, the only thing behind the seat is the B pillar so you have to use some sort of surface mount for the retractors. There is nowhere to recess them.