anti-roll bar

Hi, I've been suffering with a knocking from the front of my 2010 W204 C class going over pot holes etc. I've replaced the drop links but it is still there so I want to replace the anti-roll bar bushes but I'm struggling to find replacements. MB want to sell me a new torsion bar complete with...

My car has recently started making a funny clonking noise from the offside front wheel. It is only noticeable when going slow (<30mph) and goes away when the brakes are applied. Does anyone have any ideas before my wheel falls off? Brian