the width is measured by 1/8th's , so a 1/2" wide belt would be 4
eights. length is measured on the outside flat of the belt.put a mark on
it and use tape measure to measure around the outside of it,that gives
you the length. so a belt that is 1/2 inch wide and 59 inches long would
be 4L590 part number. 4 for 4 eigths and 59 for length . if length
measurement is 59-1/2 in get a 59 inch belt and it should fit. lucas