OutdoorPowerInfo.com, CrossBelts.com, Gates.com and Veyance.com all have belt cross-reference guides for vehicle as well as industrial applications. Most belt types and brands have a suitable substitute from another manufacturer. However, on machines that require multiple belts, users shouldn't mix belts from different manufacturers.
Many machines used in the United States are produced in Europe, the belts for which are sized by International Organization Standards or the German DIN system. The American RMA counterparts listed in the interchange catalogs are calculated by a soft conversion and may not always be an exact match for the manufacturer specified belt. Therefore, it is important to check for dimensional differences in cross sections, length and belt ride-out before substituting a U.S.-manufactured belt for a metric equivalent.