Chevrolet 2001 Express Van Owner's Manual page 22

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. To install the locking pins at the rear of the seat base,
pull the carpet/mat flap back on the inboard side to
locate the hole in the rail for the pin.
4. Remove the pin from its stowed position on the seat
base while holding the carpet/mat flap back.
5. Insert the blue or yellow locking pin into the seat
base. Possible slight seat pushing may be needed to
line up the pin with the base. Remember, each pin
has its own side. The yellow pin must be installed
on the passenger's side and the blue pin on the
driver's side.
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