Ford Mercury Villager 1997 Owner's Manual page 147

Exiting a vehicle with the auxiliary safety restraint system
Safety Belt Extension Assembly
A safety belt may be too short even when it is fully extended.
You can add about eight inches (20 cm) to the belt length with a
safety belt extension assembly. Safety belt extensions are
available at no cost (part number 611C22) from your dealer.
Failure to follow these instructions will affect the
performance of the safety belts and increase the risk of
personal injury.
Seating and Safety Restraints
WARNING
143