What is the best place to order parts for the XF?

 

The dealer. It's difficult to find Jaguar parts anywhere.

One of the draw backs of a specialty car with low build volumes.
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There is a dealer with a good online catalogue - Jaguar Merriam. You can find it on google. I've ordered from them a number of times - all original OEM parts, and a pretty easy and helpful search and catalogue details.

 

I like Mirriam and rockauto.com.