CATERPILLAR 5ft Boom It18/ It28 Booms 5ft Boom 22 1/4 Center To Center Of Hooks And 21 From Inside Of Hook To Bottom Lock Hole Call For More Info, To Fit Make: CATERPILLAR, To Fit Model: 416B IT, 416d It, 420 It, 420e It, 420d It, 420f It, 426c It, 428c It, 416 It, 430d It, 430e It, 430f It, 436c It, 436 It, 438c It, 446b It