Nifty Swifty

Hi I'm trying to identify which rear pads my A3 (8P) 2012 Sportback 2.0 diesel quattro 168bhp has without having to take the wheels off and look. I'd hoped that somewhere on-line I could simply type my vehicle registration number and it'd be straightforward but apparently not. Has anyone got any suggestions? (Or do I need to take the wheel off before I can even order the pads?). Thanks (and any advice of make of pad welcomed)