Hi I just joined and was hoping for some advice please. I recently bought a 2004 B2500 and the head gasket has blown and my mechanic can't seem to be able to find a replacement. His parts guy has told him that my engine is a " weird one" as the engine number starts with a 'W'. I believe that my Mazda may be an import but still can't find a gasket. Has anyone out there experienced the same situation and if so how was it rectified?