I have learned really that although that they are a nice display (and under-rated), they are actually not that popular. We sell some bezels at a ratio of 40:1 over the TM1637 clock displays. In reality they are great for clocks as intended (FYI there is a non-clock version of that display).
Hence, although I greatly appreciate your interest in our bezels, we only have 2 available.
However, it would not take much to make more, but there will be a 4-5 day lead time.
Regarding the dimensions, I agree that the bezel is a bit larger than the display. All of our bezels are bigger in order to hide whatever cut-out is made in the project box (usually quite messy!).
But also for this display we also wanted to centre the display in the bezel. So, we had to make other dimensions bigger to make that work. Hence the somewhat larger bezel.
We do make custom bezels, and we could I suppose make one to accommodate 4 displays. This would be a one-off as we'd never sell another. So there is a design fee, sorry to say. Contact us via our website if you want to discuss.
In any event, I am glad you have it working and frankly I think it looks like a really neat project!