Polini 3G Clutch

Greetings gents I have a 2014 super Vespa 300 and I want to upgrade my clutch since I’ve already upgrade my variator and rollers and belt...I want to purchase the polini 3g clutch but I don’t know the other suitable version of the polini automatic clutch bell kit along with fresh shaft fixing nuts. Can you help me find it on the site so that I can put it in my shopping cart?

thanks a lot for your time...hope to hear from you soon