They should all have the 350cc. I'd bet $$$$ that the 1999 hour meter stopped working years ago. This is going to be your decision! Which one runs and drives the best. $2,500.00 for the 2006 is a steal, for the 1999? Uh, it had better be near perfect. 7 years is a huge difference in equipment, electronics, etc.
Now where is this 2006 cart at, I think I'll take it