The header is usually a 2x5 pin block with one pin missing (the "key"). According to Foxconn manual documentation
These are 10-pin headers (with one pin missing) usually labeled F_USB1 or F_USB2 . Foxconn N15235 Front Panel Connectors - Google
If you don’t have the specific OEM manual (HP/Compaq rarely included one with the retail box), hooking up the Power SW, Reset SW, HDD LED, and Power LED becomes a frustrating game of guesswork. Let’s solve that right now. The header is usually a 2x5 pin block