Product notes: Includes the necessary hardware and gaskets needed for installation. OEM Numbers: E23528059 R23528059 23522190 Make Model Years Engine Model Notes Notes Detroit Diesel Series 60 1998 to 2001 Detroit Diesel Series 60 Series 60 non-EGR EPA 98 / 99 12.7L (On-Hwy) Detroit Diesel Series 60 1998 to 2001 Detroit Diesel Series 60 Series 60 non-EGR EPA 98 / 99 12.7L (On-Hwy)