Here is the link to the bearings we are using.
http://www.silverthin.com/11jsa.htm?part=JSA020
The part number is JSA020.
Thrust bearings are used against an axial force, meaning that the force is coming parallel to the shaft. So for instance with a swerve module the most likely force is going to come from a side hit, which is parallel to the shaft. Thrust bearings increase the strength of the module with the frame so that you can keep driving.