Basically we have 2 options of grommet that can be used. Grommet 25mm (smaller outer diameter) provides higher detachment force compared to Grommet 21mm (larger outer diameter), when used with our 10mm clip.
My first data to you was 21mm and later I sent you 25mm for comparison purposes only, since you have not given me your final choice yet.
With regards to the 3 mounting holes on top of front spoiler, we will manually drill after moulding process. The mould slider design may be to large and complicated if we include these holes. We can reduce mould cost considerably if we don't include these holes.