I had the 1 -1/16" and thought I'd better get the 27 mm, because there was going to be over 250 Newton Meters of torque on the crank bolt and I didn't want to strip it. As I recall, the American 1 -1/16" actually fit better. Now I have both. Oh well.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles