The modulator is held in with a single bolt and a bracket. It will be real difficult on a 201 car. You may have to lower the unit by removing the trans mount. You may have to further lower it by disconnecting the driveshaft.
I don't think I have ever done one on a 201 with the trans in the car. It's hard enough just to adjust it. Terribly tight situation.
Bosch Master, ASE Master, L1
33 years MB technician