See fitting chart to select correct size for your bike. Note that there are other 8mm spool kits that feature additional spacers and/or longer bolts for specific application. Consult the fitting chart closely before ordering.
Do not use 8mm Delrin Spools on any Ninja 1000 with stock pipes as there will be contact under suspension load.
On 2017 Ninja 1000, remove spools before riding the motorcycle if using a stock exhaust pipe. Spools will damage exhaust under suspension load if not removed.