✮ 2 Flange Hexagonal Nut. ✮ Flange ID: 64mm/2.5″. ✮ 2 Flange Hex Head Bolt. ✮ 2 Exhaust Flange. ✮ 1 Flange Gasket. ⚙︎ Easy Installation – Installing the flange repair kit is simply a matter of placing the muffler gasket between the sealing surfaces of the flanges, making sure to line up with the screw holes and threaded holes on the pipe and the gasket is secure.