I need to get a new sprocket chain kit before Saturday, for my first trackday. The manual says I need a 525 chain and sprocket kit. Yet online I find these 520 kits. Can I buy a 520 kit for the f4i or do I need to get a 525 ? Knee draggers has the 520 one for like 160.(rk chain + vortex sprockets). Whatya think ?