Replacement Version 2 Tektro M300 Left Hand Brake Assembly with Waterproof Connector for the Sedona, Rubicon, Baja, Boulderado & Rocky Road Mountain Bikes. The Version 2 has a male plug end and a female pin end.
If you have the female plug end with male pin ends, you need the Version 1. Search site for part number 48VMTN-400L-1.