Identifying a part

Hello to all. I am a newish member, but have never posted on here until now. I bought a "blown up" and partially disassembled 1999 Grizzly 600. I am about done putting the engine/trans back together, but I have a part that I know isn't internal to the quad that I can't identify. I have attached a couple of photos to maybe help figure this thing out. Thanks in advance for any help with this. p.s. for reference that is a nickel beside the mystery part.