This glow plug properly replaces and are compatible with all these part numbers: CASE: 304131 CHAMPION: AG40, AG40C International Harvester: 304131R1, 304131R2 , 304131R3, 343894R1, 343977R1 KOMATSU: D88516, D91934, 304131R1, 304131R2, 304131R3 67464 This plug fits the following Tractor and/or Combine models: Farmall / International Harvester: 403, 405, 504, 560, 656, 660, 706, (715 w/ serial# 23001 and up), 2504, 2706, 2656 This plug fits the following Engines: Farmall / International Harvester: D188, D236, D282, D301