Any question answered...

Is there a part number, like hub bearings have (e.g. 6002RS), that I can search

There is. They have funny numbers usually starting with MR but you can also search by the TH part number. They are all listed on the TH Industries web site under the ACB (angular contact bearings) tab. Each bearing has five key dimensions you will need to match:

1. Outside diameter
   
2. Inside diameter
   
3. Thickness
   
4. Internal chamfer angle
   
5. External chamfer angle