Good morning all, I hope I'm not starting a new thread unnecessarily but I have searched and come up dry. My 04 XK8 is seeping oil into a couple of the spark plug cavities and I need to find a reasonably priced source for the gasket/seals kit to do both sides. I've been fighting a reoccurring PO171 code and doubt that this has anything to do with that but the VVT seals are bad and I want to do it all at the same time. Trouble is, I can't seem to find a definitive part number for the valve cover seal sets for this 4.2. I was trying to figure out if there is a Ford part number applicable to this engine that would be less expensive than the Jag OE. The Jag number eludes me as well. Can anyone point me to a source for this info?