You linked a picture with many different types of extrusion cases. It would be helpful to post a picture of what you want and approximate dimensions. Alibaba is full of vendors selling many types of extrusion housings.If anybody has worked in the past with some Chinese manufacturer that can provide Aluminium extrusions like this, please share the name/website. I want the side extrusion as shown in the linked picture direct off-shelf and do not want to bear the price of a custom die build. So far, I only found an American supplier who I know is not an original manufacturer.
If anyone knows a manufacturer, I'll really appreciate the help.