Quick question on mud flaps?

[km406]

Are there holes, or at least spots marked to attach the mud flaps to, or do you have to align them up if you plan on doing them yourself...as I plan on doing? I see that there are two fasteners in the wheel well where a mud flap would go. Is that where you attach the mud flaps?

Also, are the mud flaps sold at h2parts.com the same as the ones installed by GM at your dealer?

Thanks