So I took the rear Z-bed out of my 1990 L to fit a large cabinet in
the back for transport.

I had installed the seat when I got the van, but the seat is from an 85.

I bolted the static end of the shoulder belts in with the rear bolts
of the seat when I installed it originally, but tonight upon
reassembly when I did the same thing it didn't seem right. the seat
wouldn't latch back to the studs correctly.

There are two other threaded holes just aft of the larger threaded
holes for the seat. does the static end of the belt bolt in with the
seat? or right behind and slightly above it with a smaller bolt?
I don't see it in Bentley.
thanks
Harry