Hi, I think orange71 was just using those numbers as an example? Usually there is a number on the bearing somewhere, if they are sealed check the plastic seals, they could be very small or a bit worn? The numbers on them will refer to the size - internal/external diameter, width and single or double sealed. I had to get some replacements for my Heckler and needed a magnifying glass to read them - 1614RS, I did google this number and found a site somewhere that explained what all the numbers meant, but it was a while ago?, or the numbers you need could be etched onto the larger outer diameter?
I'm surprised, and not very impressed, that Hope were not helpful, if anyone should know they should they made the things!!?
I've got some of these hubs, I'll see if I can find any numbers and get back to you if I have any luck - alternatively take the old bearing to a shop with you and they can measure accurately?