i bet the stealership would have one on hand; I replaced all of mine on my 919 a while back because I noticed some stretching. oddly, that and a broken inner friction disk were the only problems I have ever had on that clutch, and for years, I have tried to murder it.
Nitro I had a 919 real fun bike and I as well tried for like 50k to blow that thing up... nothing just started and ran great every single time summer or snow whatever. The most reliable bike Ive ever had period.
Got it out in the mail today. They said you should get it Monday or tuesday.
Another member here gave me that OEM set cause one part is broken on the pressure plate. The bolt is from the missng lug, so no sweat.