On an '87 300e, can anyone confirm that I need a 9 mm 12 point or xln socket to counterhold the screw so I can use a wrench to loosen the bolts on the rear links. I think that is the correct size because the 10mm hex I inserted as a test was too big, and the 8mm hex was too small. Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)