Mounting Hole Inner Diameter 3 M4, No./mount. holes 4, Inner Diameter 26.00, Outer Diameter 2 50.40, Hole Id M4, Gasket w/o, Source Bosch, Distance Mounting Holes 39.30, Material Steel, Outer Diameter 50.40, Mounting Hole Inner Diameter M4, Mounting Hole Inner Diameter 2 M4, Amount of Mounting Holes 4, Thickness 2.60