Hi Brad,
Here is the latest mics, you can see as below picture.
Here is the datasheet.
<LINK_TEXT text=“https://github.com/SeeedDocument/forum_ … %B9%A6.pdf”>https://github.com/SeeedDocument/forum_doc/raw/master/312030322%2C%20SMD%20Mic%20OMNI-32DB%3B4P-L3.76XW2.95XH1.2mm-物料规格书.pdf</LINK_TEXT>
The distance between 2 mics is around 45mm. thanks.