Before installing that wiper motor – I would highly recommend adding a good layer of paint to it first (on both sides).
I “believe” the gray is only primer, and if so, it will start to rust (and look crappy) in a short time.
If I’m wrong and that is gray paint, then disregard my statement (above).
The area not to paint would be the three rubber grommets/silver inserts (or at least the silver insert with copper ground strap attached to it), the electrical connector area and the area (threads & shaft) where the wiper transmission attaches to it (on back side).
Pull the silver insert(s) out and the rubber bushing(s) will come out easily. Reverse to re-install.
BudW