This is a A-A172785 Muffler PN: A172785Main Description As Following : A-A172785 Muffler P.N: A172785 Muffler Inlet Has 4 Hole Base PlateDim A (1): Inlet Length: 4.000"Dim B (2): Inlet I.D.: 4 Hole Base PlateDim C (3): Shell Length: 8.000"Dim D (4): Outlet Length: 5.000"Dim E (5): Outlet O.D.: 2.000"Dim F (6): Overall Length: 17.500"Replaces: A170073 Replaces: 20332A NELSON GLOBAL PRODUCTS , Crossed From: A170073 CASE-IH , 1717-1205 , Found in Section & Models : Mufflers/Exhaust Pipes > Mufflers, Case-IH CRAWLER: 450C (W/O Turbocharger), Case-IH CRAWLER: 455C (W/O Turbocharger), Case-IH INDUSTRIAL/CONSTRUCTION: 550 (W/O Turbocharger), Case-IH INDUSTRIAL/CONSTRUCTION: 550E (W/O Turbocharger), Case-IH INDUSTRIAL/CONSTRUCTION: 550G (W/O Turbocharger SN