I'm soon to be buying a h&r touring kit for my 2007 a3 2.0t fwd. I need to know the strut clamp size of my car, 50mm or 55mm, so I can buy the appropriate kit. How can I find this out? Does the size depend on whether I have standard or sports suspension? And how do I find out what suspension I have seeing as I bought the car 2nd hand? Thanks in advance!