One New Aftermarket Replacement Turbocharger. Fits John Deere Crawler: 455D, 555A Fits John Deere Engine: 4276T (TO4B32 Turbo) Fits John Deere Skidder: 440C, 540B Interchangeable With Part Numbers: AR70439T, 409940-9004 One New Aftermarket Replacement Turbocharger. Fits John Deere Crawler: 455D, 555AFits John Deere Dozer: 450C (SN 250962 > ), 450D, 550A, 550BFits John Deere Engine: 4276T (TO4B32 Turbo)Fits John Deere Excavator: 450 (TO4B32 turbo model)Fits John Deere Industrial/Construction: 410B, 410C (Eng. SN < 148514), 450B (SN 250962 > ), 510B, 510C (Eng. SN < 148514), 550 (TO4B32 Turbo), 555, 555B (Eng. SN < 148514), 610B, 640 (TO4B32 turbo model)Fits John Deere Skidder: 440C, 540BInterchangeable With Part Numbers: AR70439T, 409940-9004