I had the problem of broken wires to the boot lamp.
At the break I cut the wires and installed a MB female and male 2 pin plug arrangement.
I screwed the female part to the side support where the wire clamp was located using the same screw and hole.
The old wire in the boot lid was hard and the support clips were missing, which was a source of rattle noise.
I made a foray to the local german wreckers and I came home with the new old cable from a 70-80's car and the retaining clips also, all for about $5.00.
So now I can unplug the boot light when necessary and the only part of the cable that moves is the cable in the boot lid. The other part of the wiring harness is stable and never moves around.
Problem solved.
Bob (Brisbane,Australia)
RHD,1967 early 250 SL, auto