Nichols has unfortunately gone out of business, i fitted one last yr to my 860, we use basically the same settings as the original or adjust to suit the crop we are harvesting. try here as well, i dont think anyone is making Nichols concaves under licence , if i hear will post a message here for you www.harvestaire.com.au Phil Zani or Dean Brooks , they can supply a_market concaves,bars and other replacement parts