I can't find the original post where the OP found this solution, but this one works too.

I use this riser with this usb cable.

It doesn't need the extra power cable that the other one needs, but you have to install the riser backwards into the slot on the motherboard (usb facing into the case) as the riser was meant to be use internally. So you need a little extra room to route the usb cable out of your tower.

Also: I use it in my extra x16 pcie slot, as some people reported that it doesn't work in the x1 slot, but I haven't tested my x1 slot.