Tbitz, Wayne is right, most of the motors don't come with the o-rings. They are special RSR parts used for racing. The rockers (which simply use the same casting/maching process to reduce manufacturing costs) are the same. When I found this out during my project, I could never think of why they just didn't come on all motors, they cost peanuts, easy to install and apparently work (I'll let ya know).
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Mark
The Beast
mark@hargett.com