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Have had these on my 2015 XJL AWD for about 2 years. They are available through Car ID. but I go mine at Discount tire. They are a forged aluminum wheel and you can use your original Jaguar lug nuts and Jaguar Growler center cap.
You can find many sources on the internet. Just make sure you get a written guarantee that the aftermarket wheels will fit and if they don't you can return them at the seller's expense for a full refund. And be sure to pay with a credit card, not a debit card or check, so you can dispute that charge and get your money back.
I would stay with the OEM wheel specs - same width and offsets. Of course, the bolt pattern must be the same. Otherwise, the suspension geometry may change and adversely affect ride, handling, and tread wear.