UPDATE: 4.1 is not an official hartk board. Only 4.0.
More information may be found here.
Male header available here.
Female pins available here.
Cable gland available here.
Due to my awesomeness, I’ve been selling 4.0 boards for a while. These boards are still labeled 3.2. If you really need the 4.0 on the silk, buy the black, labeled 4.0.