This Arctic Cat 550/580cc crankshaft, part number 3004-069 (cross-references to 3005-230 and several others as well), is used and is in good shape. It has the 90B rods and the cases fit all of the Arctic Cat 550 and 580 liquid-cooled twins around '97 and older. The FAT outer bearing is missing so you will need to add yours. They slip on and off pretty easy. There is no core required. This may fit newer Cat's as well using the 550 motor. Thank you for your interest in this item. We look forward to serving your parts needs. This fits the Bear Cat, ZR, ZL, Panther, Cougar, EXT, and MANY OTHERS LOCATION AC4