Thank you Emiel, I will have a look into that!As you are in the Netherlands, than it's easier to get them from a Dutch webshop.
Here I got mine from.
You need to check the diameters of the steering. They have different sizes.
The only thing I got from aliexpres, are the 20mm wheelhubs. For a country as the Netherlands, it is very easy to get parts and help with it. Most bike shops will have the parts or can order it.