Hi guys, looking for some advice guys, ive searched and not found the exact info i need....so here goes! My dads just bought an b6 a4 with a concert 11 headunit, ...hes just bought off ebay a symphony ii headunit from an o4 a4 but what exactly does he need to change for it to fit properly? Any advice on parts numbers will be greatly appreciated! i take it he needs a new cage and a climate control unit? any idea of the cost of these things? thanks peeps,..still a great forum i feel.