Mystery Part

Hello,
I have recently bought a 2000 Yamaha Kodiak 400 from a family member to fix up. I noticed there was no oil on the dipstick so I added a quart. I then noticed oil spilling all over the floor. Upon further inspection, I realized a part was missing and allowing the oil to drain out. I have combed the web and this forum looking for what the part might be, but with no luck. Below is a pic from a service manual, but the manual doesn’t list the part. Any ideas? Thanks in advance.

-I apologize, this is the wrong thread. I will repost in another.

Attached Thumbnails

Mystery Part-mystery-part.png