Hello everyone I ask for information on my Jaguar xj8 year 2001 with 16-inch wheels that measures the distance between center and hole diameter? I ask this because I saw that I can fit wheels from 18 on the registration certificate and I'm doing research on the market used in Italy. thanks to those who can help me

 

You will have to look for rims with a 5 x 120.65mm bolt pattern.

Frankly, there are not not many aftermarket wheels made in that specific pattern any more, so you will be basically stuck with 2nd hand Jaguar wheels (X300 - X308 - X100).
Luckily, Jaguar made some some nice 18" models, and older rims can be refurbished to new.

There are people using BMW rims with a 5 x 120mm bolt pattern, but I advice you to search for the related pro's and con's of installing them.