Hello, I'm brand new to this forum, I have a 2013 Audi A4 Premium Quattro. My MMI screen is dead and I'm looking to buy one from ebay. I see two different part numbers listed , one is 8T0 919 603 G and the other is 8T0 919 603 A. Does it matter if it's a G or and A at the end? If any one know I would appreciate the help. Looks pretty easy to replace on my own. I just want to make sure I'm ordering the correct screen.