First, I had the same problem on some of my case bolts on my YZ250. When I split the case last year I noticed some of the bolts were stretched and looked warbled' <- if thats a word. Either way, I got the length and thread pitch for one of the good bolts and hit up lowes and Home depot. I was able to get what I needed there for dirt cheap. If that doesnt work for you, see if you have a Fastenall in your area.. They have just about anything you can imagine.