I've been searching for a decent one with gen specs for many years and am disappointed to learn they are no longer in production due to whatever reasons, god knows.
However, recently I contacted Yuki about it (as they did offer them before) and he told me that they didn't have plans for it. I'm sure, if we get enough interest, someone out there is willing to heat up the production again.
Rep is accepting 29mm dial whereas gen is taking 27mm. 2mm there is a lot of differences considering if you try to close the gap. On the contrary, the opening can be widen simply by putting it on the milling machine.
In the worst case scenario, pick up a rep and call it a day.