That is a beauty!
Word to the wise about stock chains - they put just enough chain on there to get by. The 500 is very hard on chains and you will be playing with your adjusters constantly to try and keep up with chain stretch. That is fine, but when your chain wears, it in turn wears your sprockets - it all wears as a set and should be replaced as a set. Enter the thought of a good chain saving your having to buy the whole setup again as soon.
Back when I worked for the dealership, we had a stack of stock chains that we would take off of the 500's in favor of quality, hi-tensile strength rated chains. We usually ran O-ring/Xring because most of our customers were desert racers and trail riders. The occasional motocrosser would want a good standard chain to keep rotational weight and rolling resistance down on their 125/250. On a 500, you have so much power that those are hardly a problem.
MG