I will relate this story for what it's worth. When we were shopping, we found a car on the lot that fit our needs, except it lacked the winter package. The dealer offered to install the package, but said they could not do the heated mirrors. I do not know the reason why, and I was not interested in having a brand new car torn apart to install the options anyway so I did not press him on the issue.
2012 Yellow Blaze Ti Hatchback; 400A and Winter Package; M&P wheels.