Friend just bought a cyberpower system for his kid, it uses this motherboard (not a bad little box for six hundred bucks with a rx560 in it) not many usb ports but several headers on the motherboard. So where can I buy a couple of backplane plugs for this board. I'm an old builder I remember the days when sometimes certain brands had their own pin assignments for their usb headers I probably have some usb 2 hanging around in boxes for other boards but no usb 3 ones. So does Asus sell these on their site someplace? Didn't see any on e-bay...any ideas? Would be nice to have one or two more usb 3 ports someplace.