Hello: I'm in need of one neutralizing cap. It's a National #159-250. It's a tubular, or coaxial type that stands about 7 1/2" tall. The larger tube is about 1.75" tall and 1.75" wide. The smaller tube is about 2.30" tall and .5" wide. Anyone have one that they would like to sell? 73, Barrie, W7ALW