I think they are switching to those large outer race designs since a smaller bearing pressed into a ring to get the diameter  might separate if the fit was a tad loose (no one expects the bearing itself to blow apart of course!)

In a pinch I have found a "standard" bearing with the needed OD, then found a smaller bearing who's OD would fit the larger ID and fit to the bit shaft stub. A slightly smaller OD washer on top and bottom to keep things aligned to finish it off. Why not spend 1/2 a day to cobble something up versus the 10 minute drive into town for a part?

Alternatively, for those large diameter needs, often you can find a bearing with the ID equal to the bits collet shaft end  and OD that  is equal to what you need. Slide the bearing onto the shaft and either use a lock collar or let the router collet hold it in place, then route your stuff upside down.


Gotta give kudos to the guy using his miter saw table to trim his finger nails. He probably forgot to install a motor underneath and is puzzled why his setup won''t cut...