I just purchased a vintage gold Parker Sonnet ballpoint. The ink needed to be replaced, but when I tried to match up available refills from local stores, I noticed that there is a slight difference in the actual ink capsule. (see photo) It's just enough of a difference to prevent my pen from using the newer refill. Does anyone here know where I can find the original Parker refills? I even logged on to the French version of the Parker Pens website, but they seem to be selling these same, newer, refills. The refill on the top came with the pen. The one below is new, and just slightly too long (in the ink capsule) to fit in my Sonnet.