Hello Peter,

you could try asking at your local dealership or a place that sells after-market shocks, if it is indeed the rubber mounts. I can't think of anywhere that would sell just those rubber bits- the front shocks are bolted to rubber/metal mounts and can cause knocking at the front, but if you car is like mine at the rear they mount directly to the body.

I'm not an expert but haveyou checked your anti-roll bar/bushings and other suspension links? could be something loose back there maybe?

As well as searching online, try picking up a copy of 'mercedes enthusiast' magazine, they have lots of ads in the back for spare parts places.

i replaced my rear shocks recently, and it was very straight-forward, but i wasn't getting any knocking from the back even though the old rubber mounts were a bit past-it and the shocks themselves were pretty much shot.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys