GMC 2002 Savana Van Owner's Manual page 59

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
1-52
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 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 passenger rear bench seat.
-
Passenger Van 3
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).
Passenger Rear Seats