This is a holder for the 8x8 LED matrix found at:
It is designed with a crossbar as a standoff for the pins coming out on the backside. However, it is not absolutely necessary if printed at just the right size as the LED array will be snug in the holder.
I made this in OpenSCAD, but lost the file, which I may include later if I get around to rewriting it.
The fit is designed to be pretty tight, so it may require some slight scaling if you want it to "just fit" into the holder.