u/Previous-Payment3302

Hey guys! I got this 09 ktm 250 xcf and I have a problem. So when I'm putting the head back onto the motor it seems like there's a indent as if a oring sits on one of the dowel pins. I included a picture that I'm using for reference but in my head gasket set there's a random oring that I can't find anywhere to put. Has anyone rebuilt one of these 09 250s? I'm stuck and need help 😫