I am planning to put a remote reservoir on my brake system If I can’t find a fill pipe. I rigged up the same on my M35A2. My M211 does not have a fill pipe on the master cylinder. The cap for the master has 1.25” threads and no shoulder, so it can be run in too far and drops into the master cylinder. I had a spare master cylinder cap for an M35A2 so I used it, but I would like to install the fill pipe or use a 1.25” threaded pipe as the extension, but need the correct thread pitch. Any pics of an original, leads on an original or know the proper thread pitch?