I recently had to remove the right case of my 03 WR450F to repair a snapped bolt. Since then I've had a slow oil leak from the oil line on the right side. I just replace the o-ring but there's no change in the leak. In looking at the fiche, it indicates TWO dowels and TWO o-rings, both with the same part #'s but indicated by different numbers on the fiche... am I missing something here? http://www.ronayers....Group/OIL_PUMP_ The parts in question are #'s 20 & 19... but then there looks to be duplication in #'s 6 & 5. Thanks in advance.