Well I goofed the install. I put two nutserts in the wrong holes. Could've been worse, but I'm a little peeved at myself. The third, lower one is one of the ones i have in the garage. the flange is a little thicker (another thing i missed until it was too late) so i tapped it down, so that should be fine. I'll pick up a few more nutserts tomorrow to finish this side out.
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@Midnight LJR Here are the pictures of the nutserts in the slider. I picked these up today, they have a grip range for 3/16" material.
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Part of me wonders if the flange head is too thick on this and i should counterbore those holes so the head sits down farther. Oh well, i need to step away for the night.