You can find all the components and replacement parts you need for your bike at Escapa.
The Shimano EW-JC302 2-Port Connector (Splice-B) Di2 is used to connect the EW-SD300 STEPS/DI2 E-TUBE cables to Shimano EP8 motors
TheShimano EW-JC302 2-Port Connector (Splice-B) Di2is used to connect the EW-SD300 Steps/DI2 E-TUBE cables to Shimano EP8 motors
Compatibility:
Shimano E6100, Shimano Steps E5000, Shimano Steps E7000 (e-MTB), Shimano Steps EP8