That's the one - nice photo
There was indeed a Shackleton flying in the US, albeit rather briefly. It's now grounded sadly, wasting away at Pima I believe. Doubtless it will fare better in the hot and dry climate but it's clearly never going to fly again. One assumes the SAAF aircraft is also destined to remain grounded now, so only the folks at Coventry stand any chance of getting a Shack back in the air one day.
Shackletons are fascinating machines of course, but 972 is a particularly interesting machine, not only because of its varied (and largely undocumented) life with the RAE, but also because of the dazzling paint schemes that it wore. Images of the aircraft whilst wearing the silver and dayglo scheme are particularly rare - I have only one although I've seen a couple of others.
I'd love to see more or know more about the aircraft if anyone out there knows more.