The absolute must haves you will need are the 4 bolts that connect the brake light housing to the rails and the shorter seat latch cable.
You can use the brake reservoir and just mount it under the tail or shorten the line and mount it under the tail like the lightning one, but you need the bolt to mount it and it is a fine thread bolt that is located no where else on the bike, so you wont have any extra of it by chance.
The wiring harness will work but may need to be modified depending on what tail light setup you are going for.