Ha, sounds like a wise move docc. I re-checked the spare nylon covers I have on my spare really nice late model airbox and with all the grommets and spacers fitted you cant mount the cover without significant distortion to the cover which is what eventually causes them to crack it appears. One mount hole on each cover is a long way out. Once that is corrected then they fit up with zero load. Might be a project for the future,fibreglass covers with the holes in the right spots. Good to know the carbon ones dont seem to be an issue,although they are very difficult to find.
I machined 1 mm off the tops of my new cover screws and they look a bit better now.
Ciao