If your bike has that option, most bikes do not have that option like your GSXR and require a full kit with mounting brackets. His 2014 ZX6R being one that does require a full kit
You can buy it from Kawaski like I did but you will get an OEM market damper that still needs the rebuild, or you can buy the aftermarket kit from Ohlins. Both are the same price range so I would go for the aftermarket Ohlins....As I made the mistake of not waiting for the aftermarket kit, and then had to send it out, also the aftermarket comes with billet brackets, and the OEM comes with cast brackets for the same price MSRP
FYI 09-12 ZX6R came with OEM Ohlins damper and mounting, 2013+ do not. Both Kawasaki and Ohlins offer it as an upgrade kit, Kawasaki sells you the OEM market Ohlins damper with their own cast brackets, Ohlins sells you the kit with billet brackets