Hi Peter,
wow, this is perfect, thank you so much! You even caught the incorrect pin order which for some reason I missed. You just saved me from having to throw away 5 PCBs (or mess around with flying wires). And it also looks like a 8x8 LED matrix now.
I actually think this is the most common size. I compared it to an old 2*5 pin I2C matrix I have lying around and it has the same pin spacing and dimensions.
The only thing I would change is the naming of the SDI/SDO pins. You named SDO as SDI Out but SD stands for Serial Data so it’s Serial Data In (SDI) and Serial Data Out (SDO).
I would have changed it myself but I see that it’s in the SVG files and I have nothing to edit them.
Thank you again for your quick help with this!
~ Alex