Alternator/Frame question

[Mangudai]

I've installed a new alternator recently and part of the instructions is add 4g wire to the + and - and the alt to the battery and one to the frame. I see rivet holes on the body but not the frame? I'm hoping I've overlooked some holes because Im trying not to buy a drill for this. Simple question I guess, thanks.

[projectRDM]

Any bolt hole will work, it's a unibody car. The 'frame' is the chassis.

[Mangudai]

Thanks again.