I'm a Korean. So I bought this in Korea. Are you German? I do not know where to sell this in Germany. I'm really sorry.
If someone in Germany does not sell it, you will probably have to buy it overseas.
Now, when I search Google for the gotway mcm2 trolley handle, there are some places to sell it, but I do not know where the cheapest is.
This is the same as the one I bought.
This is cheaper than the products I bought, but it looks a bit different.
After mounting this on ninebot one, the height is about 3 ft.
My height was so small that this one seemed to be high. hahaha
I hope my information will help you if you try this.