this guys sells 2 filter sets for $21.50 each.. (sells 1, 2 and 3)
2 - Motorcraft FD4609 Power Stroke Diesel Fuel Filters: eBay Motors (item 110557141436 end time Jul-18-10 18:01:47 PDT)
then the instructions are as jimmycat said..
easy.. just did my second since getting the 08 dually..
Sam