That is a dealer item, meaning that it can only be purchased from a Ford/Mercury dealer. It will no doubt be an expensive part from the dealer but you can often purchase a perfectly servicable part like that from an automobile wrecking company. The part you're describing is not something that typically wears out or breaks unless it is installed improperly. When you put the replacement bracket in place make sure you us all of the support braces. Look at the bracket in the wrecked vehicle and make sure you get all of the support brackets with it.