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Factory bolts usually aren't good grounds. That being said, I've used shock mounting bolts before with no issue. That's the only stock point I'd use. You can drill your own hole and run a nut and bolt through it. Either way make sure you remove any paint down to bare metal. You can check the quality of your ground by measuring resistance from your ground point to the negative battery post.
The most ideal ground is run a ground cable (same size as power) up from the trunk back to the battery itself.
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