If you are using the stock, then use the one that's currently on your car.
Don't order from ZZP. Go to Napa and get the Gates belt. I've heard a lot about Gatorback and Dayco etc betls. I needed a belt and a friend asked me to do him a favor of getting the Gates belt.
The Gates belt looks like traction tape when you first get it. Even after in pictures it looks like traction tape. There's a difference and I'm sold.