Looks like you have the answer you need but I just wanted to chime in and say that I use the same Movo screens on my MK41 actives and I've never noticed any scuffing of the finish - but mine are a little older and the Nextel grey is showing a little wear already.
You want the rubber back plate to be sealed around the end of the collette to block out any wind from behind. If you trim it make sure it still seals around the back.