The Linkup PCIE 5.0 riser cable is not compatible with the original bracket that comes with the Sliger SM580/SM570. The mounting holes do not line up. I decided to design my own bracket that will fit the Linkup riser cable. 

The holes to mount the riser to the bracket are designed for threaded m3 inserts. You might need longer #6-32 screws to mount the bracket to the chassis. I recommend not fully tightening the screws that attach the riser to the bracket until after installing the gpu because there is some some play.

This is the cable that I bought: https://www.amazon.com/dp/B0CV5XVHKN