This is the best Lister CS head gasket on the market. It is made from 1.5mm thick non-asbestos metal reinforced composite material(Interface Solutions-USA) , silicone coated and with silicone beading around critical areas. This gasket will fit many Listeroid engines as well, as shown in second image. Customers have reported that this gasket has stopped leak issues. Image shows all hole dimensions and bore size.