The Jaguar xfr 2010 I'd like to know what size bulb to put in the license plate and maybe the trunk and change them to LED I want to see if I can order them on eBay but I don't know what to put in thank you

 

You get the complete lamps, same type fitted to small Fords (UK Fiesta/Focus).
https://www.ebay.co.uk/itm/LED-Licen...kAAOSwXoJfndm8

 

+1
exactly wot he said.

Put them in mine some years ago. Work a treat.
Only issue is that the connector is no longer inside the housing and will corrode if not protected. Wrap it in some self amalgamating tape and you should be ok.