I wouldn't recommend aftermarket belts. JD specs their belts specifically for their applications. The belts are sized, not only by length and width, but by the v-groove angle. JD belts are made to fit JD products and JD specs them out accordingly. Aftermarket belts won't last as long, won't give as good a performance and won't fit properly. You're better off buying the right belt in the beginning. Use Keith's part numbers, buy from JD and feel assured that the belt will fit and last.