ALKO - Tow Hitch Cap / Verschlußzapfen

Hi guys, after I have disconnected my trailer, I realised that I lost the cap for my tow hitch.

Its a european ALKO removable tow hitch. The mechanism inside is quite delicate to dust so I didn´t want to drive without it.
A new one is about 35 euros, in my mind a little bit too much for a piece of plastic, which every person in the world will lose one in their lifetime I think :D So after serval hours: voilà! one for printing.

I don't know If all the ALKO tow hitches are the same but t