I also found 003 545 44 26 and a 001 545 38 26 but I don't know which would fit your connector. The female looks like 003 545 26 26. I've never bought the 4mm contacts. I usually pick up a supply at the wrecker taking them from inside the cabin or trunk where they are not corroded.
They might clean up OK with a little Brasso or Silvero on a Q tip and then dielectric grease or one of the specialty greases for electrical connectors.
Tighten the female contact after cleaning if not replacing.

I believe that connector is also used for the blower on a 124 (above the brake booster) and from wires coming from the oil level sensor and starter. Also in blower circuit of MY87 and beyond 126's. These connectors are mounted in the dual firewall so should be corrosion free.