I have a 01 WR 426 that I purchased about 2 months ago with a SM set up. I just bought a 450 dirt set up. I was wondering if they should just bolt right up to the 426. I would like to possibly use one chian for dirt and SM setups. The sproket set ups are SM: 15/48 Dirt: 15/47. I wouldn't think that the one tooth would be that big difference. Also what type of chain o-ring, x-ring, no ring, what brand, and who has good deals?