Hi guys. My car squeeks quite a lot from the front (especially when it's warm). A garage told me that it's almost certainly the front anti-roll bar bushes. I was thinking of doing it myself so had a look on ebay and came across the following: Cheapo, 21mm - http://cgi.ebay.co.uk/AUDI-A3-TT-FR...arts_Vehicles_CarParts_SM&hash=item33590eee31 Powerflex, 23mm - http://cgi.ebay.co.uk/A3-8L-96-03-P...arts_Vehicles_CarParts_SM&hash=item1c106bbeb7 Firstly, what size do I need - 21mm or 23mm? My car is a 2001 A3 1.8t. Secondly, how can they justify the huge difference in price?! Thanks!