...You would use a Oxy-Acetylene torch with the Smallest Tip. Careful to Heat and NOT Melt! One could also, machine a SMALL, 'Double-Claw' Hook, that 'Snaps' into the Bearings' Outer Race...Then 'Slide-Hammer' the Bearing Out. Some Slide-Hammer KITS, come with Such a Pilot Bearing Removal Tool.
I remember a few years back, I machined a Carrier out of Steel and put a Oilite Bearing in it. I do not remember the Customer.
The Bearing I.D. was machined to 15mm for the (-1) ZF. The Measurements of the Above Blueprint look correct*. I have been asked to, but have Not machined one since, as they are Very Expensive!
Last, NO Zerk Fitting...That's Why the Box Must be Packed with the Stuff. Perhaps you'll take this opportunity to Drill and Tap, and install the First 'Box' Zerk Fitting.
MJ
* Very nice Drawing of the 'Extension'! Most aren't That well Done. Using Building/Construction Blueprint, 'Arrow-Heads', I have not seen that before. Interesting!