HELP on rear wiper assembly - pics needed

[williel]

I just bought a used rear wiper assembly to replace a long ago deleted one, can someone take close up pics of the arm for adjustment and the actual base that protrudes through the lid where the wiper arm is mounted? The base looks like it just goes through the hole but am wondering if I'm missing a part.
As for the wiring, I believe Bentley has the schematic but appreciate if pics of that is taken as well.
Thanks in advance!! this is for a 86 911 but any 911-930 from 74-89 should be the same.