A zebra billy can was one of the first things I bought when I started gathering my kit together many years ago now. I now want to buy another that will fit snugly inside of the existing one. The problem is I cannot remember which size I bought. I have measured it and it has an internal diameter of about 14 cms and an external diameter ( taking into account the bail arm brackets) of about 16 cms. So which one do I have, 14 cms or 16 cms can?