GMC 1998 Savana Van Owner's Manual page 17

Replacing the Rear Seat
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CAUTION.
A seat that isn't locked into place properly can
move around in a collision or sudden stop. People
in the vehicle could be injured. Be sure to lock
the seat into place properly when installing it.
A safety belt that is twisted or not properly
attached won't provide the protection needed in a
crash. The person wearing the belt could be
seriously injured. After installing the seat, always
check to be sure that the safety belts are not
twisted and are properly attached.
2. Position the seat into the open slots in both rails.
Push the seat forward in the rail, hooking both seat
bases onto the pins inside of the rails.
3. Both locking pins that locked the seat into place
must be installed before operating the vehicle.
4. To install the locking pin at the rear of the seat base,
pull the carpetlmat flap back on the inboard side to
locate the hole in the rail for the pin.
1. Remove the trim covers from the floor rails and store
for future use.
5 . Remove the pin from its stowed position on the seat
base while holding the carpetlmat flap back.