Body Kit Fittings

[Sheriff]

Fitting skirts and rear spats but the skirts are a problem. I may have to do something with the body to fasten at the rear wheel. The Chargespeed skirts mount as normal up front but no mounting point on the car at the rear. What fittings do I need to secure and prevent butchering my car?

I was thinking some bolts with lock nuts/washers but just hesitant to drill.