1999 Pontiac Montana Owner's Manual - Page 61
1999 Pontiac Montana Manual
Page 61 highlights
yellowblue The center position bucket seat is a CENTER OR LEFT type seat. Because it is the only bucket seat with a lap belt, and has a buckle on only one side, there are certain places a CENTER OR LEFT type bucket seat should, and should not, be used. See "Seats" in the Index. If the CENTER OR LEFT bucket seat is used on the left side of the vehicle, the person sitting there should use the lap-shoulder belt. See "Rear Seat Outside Passenger Positions" in the Index. 4. Position and release it the same way as the lap part of a lap-shoulder belt. If the belt isn't long enough, see "Safety Belt Extender" at the end of this section. Make sure the release button on the buckle is positioned so you would be able to unbuckle the safety belt quickly if you ever had to. 1-55