Wow there it is! Looks just like it - except for the 6. The installation instructions are interesting. They indicate there's wrench flats to grab on both sides. unlike the ad, so maybe early version in the ad. So then, the remaining mystery is - if the L in my 6L means left hand thread, then it means I have left hand threads both sides. which is impossible. Interesting too that the instructions infer there were not special Italian threaded versions, just instructions on what to do with your English threads mounting into an Italian shell.