ACDelco Catalytic Converter Gasket - 12687885 Part #: 12687885 Line: ACD ACDelco Catalytic Converter Gasket 2 Year LIMITED WARRANTY Material: Nickel Style: Round Outside Diameter (in): 4-1/2 Inch Outside Diameter (mm): 114mm Center Hole Size (mm): 101mm Thickness (in): 1/32 Inch Center Hole Size (in): 4 Inch Show More Show Less