x2
You need the 71400106 kit.
Hopefully I can explain this correctly. The 71400106 kit comes with two new push button switches and a wiring harness that plugs into the auxiliary connector under the left side panel and you run it up under the seat to make your accessory connections there. The wiring is already in place from the dash panel switch bank to the left side panel auxiliary connector. The 71400105 kit includes the switch bank (which you already have).
Basically you remove the dash panel, disconnect the plug, remove the left side switch bank attached to the dash panel, pry the switch bank apart at the tabs, remove the existing blank(s) depending on what you are going to add for an accessory (middle position is for under 2 amps and sends power to the bare wire ends of the new wiring harness, right position is for over 2 amps and uses the relay and the Deustch plug on the new wiring harness). Again, the new wiring harness is only to connect to the auxiliary connector behind the lower left side panel, and you run that new harness up under the seat. Once you pop the new switches into the switch bank, snap the assembly back together and reassemble everything and you are good to go.
Personally, I would install both new switches while it is apart, and leave the unused connection under the seat for a later accessory. For anyone interested, this kit is NOT compatible with the 2017 models.