I usually send 50 of the crimps just in case, and usually most people aren't going to use all the connections anyways, so that gives you some more spares. If you do need another set though I sell them on my site here: https://wtmtronics.com/product/ua4c-harness-plugs/
They are very similar to the standard 3mm/Micro-Fit. However they are sized slightly different and have a higher current rating. They will not mate with standard 3mm/Micro-Fit connectors unless you solder different plugs to the board.