Hey guys, i'm in process of a top end rebuild on my 2009 250f yam, and I found something along the way. The clutch side crank case has a decent size crack in it, running across a couple spots where the bearings are seated. Anyways, a buddy of mine told me I wasn't able to purchase only one half of the case, for it wouldn't fit exactly right with my existing side.. Since I have a lack of experience in splitting/replacing/anything to do with cases.. I figured I would come here and find out, since I didn't just want to venture off on only one opinion. So, am I absolutely required to buy BOTH sides of the case if only one side is faulty? Thanks.