Pics of what you got - for free aren’t appearing in your post.

Is it an OEM harness?

My understanding is that at least three module part numbers work on US cars

I know I have seen 019 & 253 come off x5’s with the OEM hitch installation.

61358369019
61356908767
61356955253

Not sure about the bumper attachment, but I think there is enough play to adjust it