I have a perfect set of E350 power mirrors off my 02 van. I replaced with the extendable towing ones but honestly, they don't provide as good a rear view as these do. The cheapest I can find them is $50 apiece for the Chinese knock offs on Ebay. I will sell the pair for $$65 shipped to anywhere in the lower 48.
Email for a pic, I can't get them to post here.