I have been through this process of looking for crash bar on aliex and other suppliers.
Finally I went with Zanainternational crash bars.
One of the main reason I did not choose aliexpress sellers is the way the upper and lower crash guards are connected.
Here is an example of this connection
The connection with my crash bars is much more solid and from the outside.
Also I am not sure about the metal tube thickness with aliexpress sellers.
Unfortunately Zana did not provide installation instructions but they send me installation video talking in hidi. I had to figure out the installations details by myself.
My installation advice is do NOT tighten screws each alone, but install all screws then tighten them all 25% , then all 50% , etc ...