I finally got my electric towing mirrors installed. These mirrors were negotiated at purchase to be put on the truck. Anyways... I was surprised to see that the dealer left me with the original electric heated mirrors after the swap was done. I want to put them on ebay to sell, but for the life of me, I can't find a reference to figure out a reasonable price. What are these things worth fellas?? (used with about 5,500 miles on em)