Yep, I ended up buying a set of 5000k and they work perfect. The projector lamps that come with the MKX make them look like a factory set of HID's. I had to ensure there was plenty of slack in the wiring because when the headlights would turn they would unplug themselves !
I was torn between 5000k and 6000k and I'm glad I chose the way I did. They 5k's have a nice little flicker of blue depending on what angle you look at them. Couldn't be happier. I bought them from retrosolutions ebay auctions. They are cheaper on his Ebay listings than they are in the group pricing listed on this site.