Close. Wing AC and Stab AC. AC, generally for our purposes, 33% of the Mean Aerodynamic Chord.

In general, for the types of wings we fly in pattern, MAC will often be around 13" to 14 1/2" from the root, for a typical wing panel span of around 33-34". Find that chord on the panel, and go in about 33% from the LE. That will be the vicinity of the panel's AC. For purposes of calculating tail volume or its coefficient, that's adequately close.

Good luck.

MattK