I`m assuming you have the 'correct' mirror...
I dont ,I use the 72-81 style bullet Camaro mirror...but on mine one wire broke , so I just bought another mirror off EBay, wonder if the wires are the same?? If so you could buy a used later style mirror off EBay , and change the wires..?
they usually go for $10-20 for a 'single'...