You'll need to measure your eyepiece in "mm". Also determine if your eyepiece has an outer ring the eyepiece will slip over. You can find eyecups/guards on Ebay. Search under Binocular Eyecup or Binocular Eye Guard. There are also eyecups under "rubber eyecups/rubber eyeguards" but alot of these are for Microscopes and may not fit. You will need to pay close attention to the mounting type and measurements.