This is AMS Hub holder if You need to place yours AMSs on the left side of the printer.
Step one - mount AMS Hub onto this holder with original screws for your AMS Hub. The holes are good for create threads with screws itselfs easily. Be careful. Screw it gently. If you have problem, you still can use nuts at the back.
Step two - use original spool holder to mount this model. You need two pcs M4*10 or longer (max 40mm) screws and pads to connect it together (see photos). Holes are good for create threads with screws itselfs easily. Again - be careful.
I mount it without any issues. But if You have problems with M4 screws, I can make model with inserting nuts into the model body.
(sorry for my English)