225 tires will rub in a w124 car. 215s will not. If you want the widest tire for 16" wheels try 215/55/16 unless you roll your fenders, then 225s will work. I know cause thats what I have and I have rubbing problems since I havent had my fenders rolled yet and I might not get it done if I can fit 215/55/16 tires in there without rubbing.

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89 300E Pearl Grey Metallic
7 Spoke 16" staggered wheels (SLK)
215/55/16 Hankook Ventus HRII H405 tires
Euro Headlights
Smoked Corners
Smoked red/clear tail lights

1987 300e Black Metallic (mom's car)
8 hole 15" wheels (C Class)
Clear Corners
Red/Smoked tail lights