Savaria Toyota Sienna Owner's Manual page 12

2. Fasten the front retractors to the tracks (L-track rails in the Caravan,
and L-track oval pockets in the Sienna) located on either side of
the floor as shown in the image below. To attach a retractor to the
track, push down and slide the retractor fitting along the track until
the spring-loaded plunger is locked in place. For the Caravan (1),
both left and right retractors should be located the same distance
from the front of the lowered floor. For the Sienna (2), both front
retractors should be located the same distance from the sides of
the lowered floor.
1
Pull firmly on the fitting to ensure that the plunger is properly
seated and locked in the track.
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2