Hi all,Time for me to upgrade....Are these the ones to upgrade to aero wiper arms? for a A4 Avant 2003.Genuine Audi A4 B6/B7 [8E] 2001-2008 - Front Aero Wiper Arm & Blade Kit - RHD | eBay heard you need a special tool?Any tips?Any known problems with the install?Any help/advice is great!Thanks