Hi, hopefully somebody will be able to assist me, I have just taken delivery of my 2013 model XF Luxury and when ordering I for some mad reason forgot to add the auto dimming mirror !! I have spoken to my dealer who says not a lot can be done, other than pay silly money to get it added ! So do you know if it's easy to swap a non dimming for a dimming one ? I have located one from a damaged salvage from a 2012 model. So is the wiring already there ? Is it easy to retro fit ? Any help would be appreciated.