Huh?
Maybe the keys have changed, but I was able to get several sets made... (re-reading, they probably are different... for a 560)
Also, I always looked at the keys with the rough top like Screens on the doors...
The smooth top as the smooth hatch and bigger...
Keys rough key par to the short side of the door handles or the reverse, but both the same way on each side..
That was for a 2008 550, new ones might be different, and I was able to get them duplicated, no problem at a Fred Meyers up here, any big store with a key thing should be able to do it..
I did use the little "Paint Pens" or a Scripto Perm marker - doesn't stay on as well, or the small colored electrical tapes to mark both the key and the handle on how to put them in to open. That might help..
Those double keys things are a PITA to get duplicated, due to the blanks not carried normally.