Try bike bandit, also a while back in a post someone listed a majority of OEM dealers and there sites, most of them have a part # locator ,I don't know about where you live ,but here in colorado we have a place called Rocket Seal, and they have or can get any type,size of oaring you could need, with no minimum's, you might be able to get what you need through them or try CAT, Komatsu, john Deere, all of them use Metric o-rings, you just have to be a little resourcefull....