Hello all let me first mention this is a great website. I have been lurking around here since i got my 2007 LTZ 400 about a month ago and it has been a great help. I am needing to order some parts and I noticed there is options for K3/K4/K5/K6/K7 etc. Well the thing I don't understand is my LTZ's VIN has K4 in it and the 10th letter is a 7. So is my bike a K4 or K7? I read the difference in years thread in the FAQ section and it says 05' (k5)-08' (k8). So i assumed my bike is a K7 but i saw K4 in my VIN and now i am thrown off. Your help is greatly appreciated and keep up the great site.