Ponch, who used to make up the kits, had a bad accident several years ago and has nothing to do with therm any more. You are on your own to make up your own set, unless another member has picked up where Ponch left off...
Unless you are doing a lot of high speed highway riding you will really appreciate the swap out. The different rear ratio makes throttle response a bit better and makes 5th gear a useable gear for other than expressway riding...