grip driver side a column (mb-code 75)

hello people, have another question. mb would like for 2 grips (a-pillar re. and li.) incl. installation 301€ incl. VAT. grips incl. mounting material for both sides cost 131€ without VAT. the installation is too expensive for me as early renter and you can certainly do that yourself. for consequential damage I have to we ourselves, because the retrofitting of the daimler ag is not tested or released. can someone please tell me, however, how I get the covering of the a-pillars and whether it is no matter at what height the grips are attached, or is there exrta predestined for it? thank you for your informations ??