9 pin motherboard to case usb

my pc case has two usb ports on the front, but only wires from one to connect to the motherboard. where can i buy a new wire for the second one?
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More about motherboard case
  1. USB only needs 4 pins. Normally the case has a single cable with 8 pins that plugs into an 8pin block that controls 2 usb ports on the motherboard.
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