Its the T40 torx bolt in the middle of the spring (opposite side). There's hardly any room between the bolt head and the strut tower, so you may have to lift the engine and remove the mount on that side. I didn't lift my engine and managed to partially strip the torx head.
Here's a picture I snapped real quick:
Its the brass colored bolt. Yours is probably not brass colored (at least anymore) but that's the bolt.
