I just got a call from Demolition Man asking about filters, so I was planning to post this anyway. I bought four filters from the Ford Dealer at $33 a piece, only to find I had a box of the same filters on my shelf for my BMW 330i. The Ford part is even delivered with the BMW crush ring! It is Mann #HU925/4, it is delivered with the O-ring. You can buy it from
www.bavauto.com (Bavarian Autosport) for $7.95 (Their part number is 11 42 1 427 908). It comes with the O-ring. They also sell a nifty 36mm socket for the cartridge removal (Part #02341). I was lucky that my Ford dealer took back all four filters and refunded my full $134 plus tax! I spent $31.00 for the four filters from Bavarian Autosport. :banana