HE531VE PACCAR ISX MX-13 Exhaust Manifold Adapter to T6 Divided Turbo 2014-2019. HE531VE Bolt Spacing: 2.875" x 3.30" (73mm x 84mm). HE531VE Port Shape: Undivided Open Port. HE551VE HE561VE ISX15 15.1L Manifold Inlet Adapter to T6 Divided Turbo K31 CM871.