Welcome to the forum. It’s a great car to own and drive.

lightbulbs
Lots of information on types of bulbs required for the XF has been posted online and in this forum
Have you attempted to search Bing, Google and this forum?

Best to do a little digging, educate yourself then circle back around for confirmation on material you’ve read. There have been a few changes to the bulb numbers in 18 years.

in addition, there are lots of how to videos on YouTube
knowledge is power.