I'm pretty sure the atlas rail can use the holes from your swivels. Since it's an Accustock, you shouldn't need the inserts in your second link. The screws should thread directly into the aluminum Accustock rail.
Here's some info from someone who only had one sling swivel and added a second. Might help to explain what I'm trying to say.
http://www.savageshooters.com/showth...d-in-Accustock
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