MOBO-USB hookups

On my motherboard I have two places to plug in USB arrays. I assume they are typical. There are 5 small pins above 4 pins and there are two of these labeled USB3 and USB4
They appear to require a single plug that will plug over each set of 5 and 4.
My problem is that the plug that comes off my case mounted USBs is a flat single row of 4 pinholes with a seperate plug for a ground wire.
I can’t figure out how to connect these to the MOBO.
The MOBO manual isn’t much help.