Thanks so much xcel!
I found a place online yesterday that included the attachment kit that the dealership told me they would have to order and would be extra. The price for the mirror and kit online were $40 less than the dealer's quote so I called the service manager and told her. they looked it up and said they could give me their price, which was still ten dollars more than the internet price, plus labor.
I'm going to look for the best deal online today (thanks for that donnelly link!), and let hubby install it.
