This part number was already posted. You're absolutely correct, it is 33-2347. I guess it's official now.

Finding a K&N filter for any vehicle is actually pretty easy. Don't use the online make/model tools, because they are often incorrect. Just write down the factory part number (printed on your '08 paper filter and also listed in the owner's manual: 5M-6Z-9601-AA) then go look it up in the cross-reference section of the K&N book at your friendly local parts store. It shows if a K&N part number matches your Ford, Fram, GM, Purolator, etc. part number.

I could not find it locally so ordered one May 24 from Amazon for about $35.00, free shipping. They sent several updates saying it's back ordered, the latest one today. It's now estimated for mid August shipment, so I canceled that and re-ordered from AutoAnything dot com. $37.95, free shipping. Their site says it's in stock, but we'll see.