Have you asked Boca Bearing yet?
Custom bearings are exceedingly expensive; I can't imagine even a high-volume place like OS getting a bearing that is so far from standard as to have unique sizes. Different seal or precision options, yes. Entirely different sizes -- egad! Chances are that they're a common inch-size standard, and your only challenge in ordering them from a catalog would be getting the right options in quality and seals.
Topic: Fox 15 BB bearings ? (Read 654 times)