Check out my DIY on replacing the ball joints on the 124 (300e) - it shows how to support the control arm (and presents some of the hazards) and the sizes of the tools required to remove the struts. I beleive it's a 7mm allen wrench and a 22mm box-end socket to get the top of the strut freed.

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89 300te 222,222
92 300e 190,000