2004 EC 300 wheel spacers
 

Hi all,
I'm looking for the front and rear wheel spacers, the ones that are held between the bearings, not on the outside of them, for my bike's wheels.

Or, if anyone has the OD, ID and length for each of these parts I can look into making or sourcing a set.

Any suppliers out there you can lead me too would be awesome as well.

Final question, I noticed there was an O ring on the rear spacer, set in the center. Is this to keep it from moving off center of the bearing races? Is it necessary or a racer mod for some other trick?

Thanks
Bob