I'm having trouble cross referencing my belt. I need a new one, but i can't find one with the numbers I have. The belt has bando 23100-KEB7-9000 on the belt, but I looked two different places and the both cross referenced to two different sizes. One was 729-18-30 and one 838-18-30. Does anyone know which one is right? I find it odd that the same part number would be used for two different sizes.