I don't know if anyone has posted this yet, but I replaced both front wipers today with Bosch Icons. I upgraded the size to 21" from the stock 20". I don't know why Ford always puts small wipers on their vehicles. The book calls for the 2007 Expedition to get Icon 420A on the drivers side and 420B on the passengers side. I installed 421A and 421B. I have read people putting 22" blades on, but I thought 21" was plenty and they make 100% contact with the windshield.
I am a little OCD about my windshield and these wipers are a big upgrade over stock.