Hi Steve, I have no idea but what pulleys do you have on the deck belts are they "A" section or "B" section I get angry when I see "A" section belts on the cutter deck. They fit "B" section on the cutter deck for a reason Maybe that is the reason for the discrepancy in the lengths. On a mates Greenfied when I changed the belt from "A" to "B" it had to be 100mm longer. Doesn't make sense that your cutter belt would be 100mm shorter
