I just did this today on a W116 300SD. It has no door switches. I discarded the vacuum system entirely and just mounted actuators in the door. If I remember correctly (I've had a nap since then) the violet, violet black and red from the electronic box connected to wire from the fuse block I installed under the hood, the white black and brown black went to ground, green black and blue black went to actuators. I think that's it, but if you want me to make sure send me an email. The kit was about $60 and included every hardware imaginable, 4 actuators, 2 keyless push button thingys, and capable of dome light, starter disable, etc.
Rev Dr. G., Church of the Sub-Genius