apols I havent had a gal in a few years, I have a 57 Sharan, the switch to an aftermarket nav unit was pretty straightforward.. I don't think you need to change your switches, they should already be rectangular right ? looking online it seems the border around the nearly double din unit (top and bottom) are in the way... I know some chaps have previously mentioned the fascia part number and I've heard the price is between 12 and 35 quid... I can't imagine there would be any further cost..(quick search on the forum for this pls.)