Whirlpool semi defrost refrigerator. I am getting power to frig but it wont get cold while

Question

I am getting power to frig but it wont get cold while cleaning it noticed a small piece of metal fell from behind freezer, unscrewed freezer top and the I guess you would call it part of thermostat wiring was broken, it is a u shaped wire with a plastic hose surrounding it, it is connected to outside temp control that has a push button to turn on defroster. Does anyone sell this type of wiring so that I can try to fix it myself? Thanks