Hole sizes for side moulding

[Sergei]

Well as part of me project i got them side plastic mouldings with integrated wheel arches for D1. They do require some drilling to be installed, so question is - can someone tell me size of drill bit? I am not looking forward to make holes that are too big/too small in body panels

Thanks!

 

[JJMyerz]

In times of doubt, go small you can always work up.