Paul,
I think you are refering to the 'square' latch. My bike actually had one of those, even though its a K2. I ended up putting a round latch on it just to make sure my seat was going to marry to it properly, but in saying that, i think it will work with both types. As MiniMo has mentioned, i beleive the mounting points are the same.
As everyone else has said, 8000 grand.