Everything you need to run Can bus with Big tree tech boards.
EBB36 (no max31865) is used on Pancake style motors like Clockwork 2, V0.1, LGX lite and Sherpa mini
EBB42 (no max31865) is used on square style motors like Clockwork 1, LGX and others
U2C is the can bus interface board that communicates to the Raspberry pi and the MCU
More info here