Are you talking about THIS one?Leatherman lists one of these as being specific for the Core, but fyi it's really the exact same device, but comes with a larger sheath to fit the Core.
Ah, I didn't realise that they marketed that bit diver as specifically for the Core, but I'll confirm that the one I have fits that Core, Juice, Kick, Fuse, Blast and maybe one of the pruners?The tool adapter (as LM123 point out) is a bit of a different animal - the main advantage of it is that you can angle the bit at 45 degrees, which I've found useful a couple of times.
Hey,OK, well then the local distributor DOES have them. Well, that's cool. So you can use 'em on all the other models as well? Nice!