4010 stepped collars confusion.
 

Hi all. My 2011 mule 4010 4X4 says I need a stepped collar on the DRIVEN PULLEY bolt . This collar was not original when bought. The primary drive pulley on the other hand has stepped and conical washers. I'm confused cause the driven pulley has an actual cutout where the bolt goes, as if something belongs there. The collar used on drive pulley doesn't fit on driven pulley, so it's not the same. Nothing I researched can find this collar if it exist. Can anyone give insight into this confusion?