Cylinder Head Ancillary Fixing Kit - O.H.V. Models (Studs, Nuts & Washers) Includes: 6 x manifold studs, 6 x brass manifold nuts, 4 x large manifold washers, 2 x small manifold washers (for the 2 end positions), 3 x thermostat housing studs, nuts & washers, 2 x heater tap studs, nuts & washers.