If you want to run the 60/30 combo and the listed belt isn't long or short enough, you can get 8mm pitch belts in a multitude of lengths from a generic belt supplier .. on my Moulton, I'm running an 80/25 with a HTD 1320mm belt.. off the shelf from a belt supplier.. low cost.. I've also ordered sprockets/cogs from driveline.com in the past..