I'm swapping the front wheel bearings on my '05 Mazda3 this weekend, and the lower ball joint bolts look like they wont come off unless I want to cut it right down the middle. Corrosion has gotten the best of them, and the socket will just skip over the hex and strip the crap out of it. Where can I find the OEM P/N for this bolt/nut pair? I found the shop manual online, but it doesn't specify the size of the bolt/nut etc. anyone have any idea?

This is for the pinch bolt at the bottom of the steering knuckle, which is pinching it onto the lower ball joint.

TIA