It really is 12x1.25...
shift knob thread size
shifter thread size?
If the 2007s have the reverse lockout, where you need to lift the plastic guy to get into reverse, you'll have to either find a knob that is compatible with that feature or delete the reverse lockout by removing the mechanisms.
Mine: 2006 Mazda3 s GT Hatch: 111k, Gray, Manual
Gone: 2002 SVT, #1654
Hers: 2010 Focus SES: 84k, Ebony, Auto, Moon and Tune