Those are used to connect your bridge ground to the circuit ground. You need this since the HZ are passive pickups, and since you are using the quick connect system (which emphasizes solderless installation). It has instructions right below where you have pictured, "Attaching the bridge ground wire" (1-single black wire with a connector and a IDC connector). Essentially IIRC, connect that wire to the remaining ground terminal on the volume, the use IDC snap piece to connect that wire to your bridge ground wire.
Last edited by srvlives4evr : 01-21-2014 at 07:27 AM.