Chevrolet 2000 Express Van Owner's Manual page 64

If your vehicle is a cargo van, the anchor for a top strap
is located at the rear of the seat cushion on the right
front passenger's seat.
Cargo Van Models
If your vehicle is a passenger van with rear seats, an
anchor bracket for a top strap is located at the rear of the
seat cushion for each three
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passenger rear bench seat.
Don't use a child restraint with a top strap in the right
front passenger's position, or in any four
rear bench seat.
Passenger Van 3–Passenger Rear Seats
Anchor the top strap to this bracket. For the left
outboard seating position, use anchor point (A). For the
right outboard seating position, use anchor point (B).
For a center seating position, use either anchor point (A)
or (B). Once you have the top strap anchored, you'll be
ready to secure the child restraint itself.
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passenger