1OE Number: The chain saw ignition coil replacing part number is 503639801 for reference, please double check the part number of your original before purchasing. 2Applicable Models: The heavy duty chain saw ignition coil is especially designed replacement for 394 394XP 395 395XP with perfect fitness and high efficiency. 3High Efficiency: The chainsaw ignition coil can effectively improve combustion efficiency and strengthen electrical performance, delivering a better using experience. 4Fast Response: The chainsaw ignition coil can provide a higher intensity spark with faster recovery and response, providing you with more convenience. 5Convenient Installation: The chain saw ignition coil is made with high accuracy process for exact match, you can directly replace your worn or damaged ones for time saving.