Some time ago one of my accounts purchased a Wright Centauer ride/stand on mower. It is the same as the one used in that auto insurance commercial. "All" the belts are proprietery to this machine. Off the top of my head, one of them is 5/8 X 640mm. I can't find that size except from Wright. On Monday, I am going to check how much the spring loaded idler's will compress or take up to use one longer or shorter. Not a bad machine but all the local dealers have dropped that line/brand of machine.