In your photo I see you're using BC's POS bracket. That bracket just holds the pump. The bracket in your hand bolts to the thermostat housing and is used to set the tension on the power steering belt. There is a threaded hole in the lower right corner of the bracket that's bolted to the pump. Put a bolt through the slot on the bracket in your hand and thread it into the threaded hole in the bracket while holding tension on the belt.