I don't know what you asked them, of course. But the part is very general-purpose and I'm not surprised if they don't know how to help you apply it to your Europa. They could still answer you. Maybe they're like the British suppliers though. Most are kind of helpful if you're about to order. Otherwise, forget it.
When I get to it and figure out how to get the door off, I'll have some questions for Hachille. I don't really understand how he has them mounted. I suppose I could figure something out, but would like to benefit from his experience.
Google translate was only so helpful though when it gave him "Be careful, you have to be empty or there are red arrows." ! I know all those words, but I sure don't know what that means! :-)
Below is the page detailing the part, -12 being the specific one.
Hello
This means that the ball joint must be able to move up or down. The red arrows show that the space is available to move up or down.
When using a 26mm cone 2 drill bit, you get a tight fit with the igubal ball joint. It is possible to push it in and it will no longer slip. The igubal ball joint has a diameter of 26.1mm.
By using a new drill bit and a 17mm socket to turn it, it is the outside of the socket which is +-25mm that centers the drilling. The drill bit is between the two drillings.
I hope my translation is correct