I am rebuilding the top end for the first time on a very low hour 2005 YZ125. I noticed after I got the cylinder pulled off and over to my workbench that one of the stainless steel dowel pins that goes over the two left side cylinder studs was stuck in the cylinder hole (thats another story, I can't get it out of there). I went over to the bike and did not see the other one around the cylinder stud. In case my description of the part is vague, the part number is 99590-10114-00. I also noticed corrosion around the stud that was 'missing' the dowel whereas all the other studs were clean as a whistle. Is it possible that only one was installed at the factory?