Replacement flywheel for 855 & N14 engines with 15.5" clutch and small diameter for 8 spring clutch. replaces Cummins #3021660 with casting # 129594. This flywheel must be shipped truck freight. ALL MANUFACTURERS NAMES, NUMBERS AND DESCRIPTIONS ARE USED FOR REFERENCE ONLY AND DO NOT IMPLY THAT ANY PART OF OUR PARTS ARE PRODUCTS OF ORIGINAL EQUIPMENT MANUFACTURER