Chevrolet 1999 Express Van Owner's Manual page 15

1. Remove the trim covers from the floor rails and store
for future use.
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 pin 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.
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5. Insert the red handled locking pin into the seat
base, lifting the seat slightly to line up the pin with
the base.
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