Hi, I have an A3 sportback from September 2007: which bluetooth retrofit kit do I need. I am seeing on ebay that some 8P0 862 335 kits are only supported on the A3 up to 2006. Which end letter do I need for my 2007 a3 ? I saw on www.navplus.us that the latest version for Europe is the 8P0 862 335 Q MY 2008 (Europe, sw 0350) . Would an older version work anyway? Any known limitations on older models? Thanks for your help.