All I need to replace my rear shocks apparently. I am experiencing a knocking sound from my rear nearside when i start and stop the car. Two firms so far have explained that my rear shocks need replacing. The question is, what do i buy? I need a pair of shocks that are bombproof and will outlast the rest of the car. I don't want anything sporty as my Lupo is a commuter, motorway use only, mainly straight lines and approx 40 miles per day. Thanks in advance. Trebz