They will fit, but they are the incorrect size.

W201 wheels are 15" X 6" wide and carry the tire you mention.
W124 (300E/D) use a 15" by 6.5" wide wheel and use a 195/65 size tire.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles