I am in the process of retrofitting my 77 Diplomat (Diploral) 2.8E with electric window lifters. I have the original window lifters plus the cable set available. I did this work already in 1984. At that time however with the advantage that the donor vehicle showed me the exact procedure. I will replace the still missing switches first with switches from another vehicle. Unfortunately, no holes were drilled in vehicles with crank drives. the body, so that I had to re-drill it. With 8 holes not always easy, because actually the doors have to be unscrewed, in order to pierce the holms of the A and B pillars correctly. The cable set is from the younger models with switch set in the center console. I have created a specially made schematic as well as detailed conversion instructions. Who has done this already, can gladly speak. An exchange of experience is f For everyone’s help.