Ford Mercury Manual page 499

When one of the rear wheels is off the ground, the transmission
alone will not prevent the vehicle from moving or slipping off the
jack, even if the transmission is in P (Park).
Note: Passengers should not remain
in the vehicle when the vehicle is
being jacked.
4. Block the wheel that is diagonally
opposite of the flat tire using the
wheel chock provided with your
vehicle.
Location of the spare tire and tools
The spare tire and tools for your vehicle are stowed in the following
locations:
Tool
Spare tire
Jack, lug nut wrench, jack handle,
wheel chock
Roadside Emergencies
Location
Under the vehicle, just in front of
the rear bumper. The spare tire
winch drive nut is located at the
rear center of the cargo area
under a lid.
Behind the rear seat under the
carpeted floor lid in the cargo
floor. The tools are located in a
bag attached to the jack.
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