We're rebuilding a YZ426F and we'll be replacing all the o-rings. Is there any cross reference to generic o-rings instead of buying them from a Yamaha dealer? Seems ridiculous to pay $2 or more for a single o-ring when I'm sure they are just standard off-the-shelf o-rings. Same for the bearings. It's difficult to tell what size an o-ring is after it's been used. Does anyone know how to look up the size/material for each of the part numbers?