I do not know from experience if the 14 inch wheels from a 380 will work, but something tells me they will. I do know that wheels froma 190 will not fit, there will be interference because the offset is wrong. If you can, find 15 X 6.5 inch wheels from a 420SEL, 560SEL/SEC etc. W126 chassis. I believe the offset is ET23 (not positive).
Flat Face chrome wheels p/n
126 400 4102 will fit your car.
These will give better steering response and handling will be improved as a result.
Use 205-65-15 tires and the speedometer will scarcely be affected.
DDH

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!