Ford 2012 Mustang Owner's Manual page 242

Roadside Emergencies
WARNING: If the vehicle slips off the jack, you or someone else
could be seriously injured.
WARNING: Do not attempt to change a tire on the side of the
vehicle close to moving traffic. Pull far enough off the road to
avoid the danger of being hit when operating the jack or changing the
wheel.
Note: Passengers should not remain in the vehicle when the vehicle is
being jacked.
1. Block both the front and rear of
the wheel diagonally opposite the
flat tire. For example, if the left
front tire is flat, block the right rear
wheel.
2. Remove the lug wrench, spare
tire and jack.
242
2012 05+ Mustang (197)
Owners Guide, 1st Printing
USA (fus)