The X Carriage wiring is pretty straight forward. Polarity of E0 Therm, E0 Heater and Bed Therm is irrelevant.

The 2 4010 Blower fans are wired together so you only need 1 set of wires going back to the board.

To make the connector I soldered the 2 + wires together and the 2 - wires together. I than cut the length I needed from the original 5015 blower fan and soldered the wires together.