Since this is an old post, I will add this information for what it is worth for any future references. Yesterday I was under the car and noticed that the rubber on one bushing of the left lower control arm was looking rather brittle and "tired", so I proceeded to try and write down the factory part numbers for all of them, but due to their individual positions, I was only partially able to do. Still, the following information might be useful:

On the rear side of the right hand side control arm the bushing is marked as 124-333-4214, and also SP 735 383 S5. On the left front side of the left side control arm the bushing numbers are 124-333-4314 and SP 735 383 S6.

Hope this info is useful to someone.

-Alex

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W163 ML230 EURO SPEC 1999
W124 300E 1986