Mike, does your wheel tilt/telescope? My 1991 300TE is definitely a W124, but I still have a manual driver's side mirror adjustment. The only time I touched cupholder to turn signal was during a sweeping exit ramp when I pushed the lever forward to get high beams. I think the thing is great. If I were to order the Griot's units, I'd be a lot more stressed over placement, as well as drilling four screws into my door skins.... Thanks for the tip. Best $5 I've spent in a long long time