So it turns out that any Jaguar not equal to X-Type and newer than 2000 use the same caliper mounts and have interchangeable brake components. I sourced cali... Show morepers for 380mm front and 376mm rear rotors from eBay (search 2010-up XF/XK/XJ Supercharged). Then purchased x-drilled and slotted rotors spec'd at 2012 XF Supercharged. About $700 later, I have brakes that are about 2" larger diameter than the 326mm OE brakes - all factory Jaguar parts.
Stopping performance is much better and these seem to outperform the BBK projects I've done in the past with 4-6 pot Brembo and Stoptech calipers - and it's way less expensive.
Wheels are 22x8.5 Rosso Affinity with Nankang 245/30/22 tires