Here is a New Genuine Western/Fisher 12 Pin Repair Harness Kit 49367K.
This gives you both sides: the Truck Side (part # 49310) and the Plow Side (part # 49319). This is for the 12 pin relay style wiring only, which is used on Western Unimounts, some Ultramounts, and Fisher MM plows.
We recommend replacing the whole harness instead of the repair ends, but this is a cheaper, easier way to do it.
Make sure yours is a 12 pin, as they also have a 9 pin which is a different kit.
Don't forget a tube of dielectric grease and the covers to protect them in the future.
More Information
Plow Brand
Western, Fisher
Truck Manufacturer
Chevy/GMC, Dodge/Plymouth, Ford, International, Jeep, Nissan, Toyota