Presoldered jack, push-pull pot, with a capacitor.
To connect a push-pull harness to a Box Bucker Gen 2 or any other split coil pickup connect as follows. There is a long black wire which is the ground wire for the bridge. The shorter black ground wire connects to the black ground wire on the pickup. The white wire from the push-pull pot connects to the white wire from the pickup. The red wire from the push-pull pot connects to the red/green pair from the pickup.
For a standard connection only connect to the black and white wires on the pickup. Cover the red/green wires with heat shrink.
Push the knob in for humbucking and pull out for single coil.