For 1990-2009 cars

If the floor mat has a snap retainer, a grommet in the driver side floor mat attaches to a hook on the floor of the vehicle to secure the floor mat. To remove the floor mat, pull the mat towards the rear of the vehicle until the grommet can be removed from the hook.

If the floor mat has a knob retainer, a grommet in the floor mat attaches to a knob on the floor of the vehicle to secure the floor mat. To remove the floor mat, turn the knob till it is aligned with the slot in the floor mat grommet and pull the floor mat up. To reinstall, center the slot in the floor mat grommet with the knob on the floor and set the mat in place. Then turn the knob until it is perpendicular to the slot in the grommet to lock the mat in place.