Hey! I found something probably useful as regards plugging those holes.
I did not suggest simple self tapping screws as bad things can happen. But if you get the right type, then you have simple installation with high mechanical grip. Although I think the wood dowel bit would be better personally.
Steeda SRI w/CAI intake. Trubendz SS 2.5" . FR Susp/Struts. Tune by Tom (FocusPower). Rota Grids. SAP rear spoiler. Custom front air dam, rocker panel bits and Rear valance.
Last of the Hatches #28