Set of 4 individual solid aluminium carburettor mounts to fit 40mm carburettors. Machined from solid aluminium and provided with gaskets on the carb side that have a built-in rubber seal to provide some absorption of engine vibration. Supplied with thackery washers and nyloc nuts for the carb side. Requires four x FL021 40mm paper gaskets (and an FL022 inlet manifold gasket) to fit. The original rubber carburettor mounts whilst giving excellent shock absorption from vibrations are prone to failing from the constant stresses of heat, vibration and fuel. These solid aluminium mounts allow you to fit once and forget about them! It is not necessary to use a carburettor support arm with these mounts. If you wish to do so it may be necessary to enlarge the hole in the engine mount as there is not anything like the same movement available to fit the arm to the carbs. PLEASE NOTE, THE 'O' RING IS FITTED AGAINST THE CARBURETTOR.