As predicted, my wife's 04 XJ8 that underwent surgery for a leaky air spring a few months back, now befell ill to a nonfunctional compressor. I searched online and found dealer numbers like $900 and rebuilt numbers like $600. Arnott Industries came up as an OEM supplier that happened to be liquidating late model air spring compressors for $379. Brand new. Exactly like the one it replaced, I'm very happy to have saved hundreds. Actually a thousand or more since this forum helped me to diagnose the problem rather than pay a factory tech as well.
So drop whatever you're doing and go get one of these pumps, even if you don't have a Jag. It's worth the price.

 

Hi. do you have a link to a website or phone number for this? Looks like I am going to be needing one soon.