Lads, I've been offered some 20 inch XJL staggered wheels, 9 front and 10 rear. Would they fit in my 2012 XK? I tried looking for info in previous posts but couldn't find the answer. Thanks!

 

I'm no expert, but-

XJ 20" wheels 9" ET49 and 10" ET46

Source:
https://www.wheel-size.com/size/jaguar/xj/

Using the same website for XK wheels, it appears that some of them were the same size and offset.

 

Are the lug spacings identical? Hub size identical? I don't know, just asking pertinent questions.

 

I have no answer to that, it has the same number of lugs but I don't really know if the space between them is the same. Will probably have to go and look at them, just wanted to double-check before taking a 30-minute ride.

 

Yep, the PCD (Pitch Centre Diameter) and hub holes (centre bore) are exactly the same.
PCD is 5x108 on all modern Jags, centre bore is 63.4 mm.