CE-550
If you do a CE500 series rating (CE500,501,550,560) in the USA, you get a CE500 rating on your license - regardless of which aircraft the test was in.
When I converted my license in Oz, they initially issued me with a C500/501 endorsement.
I sent CASA my training report from flight safety indicating I had done the course in a CE550 with Bravo differences, whereupon they immediately re-issued my license with the C550/560 endorsement included.
(Oh, and Citation II is a 550 - not a 560 ;-))