I made this micro sd to sd card adapter mount in fusion 360. I made this one from scratch because I wanted one that uses the stock hardware on the CR-10, held an extra sd card and still gave access to the USB port. You do not need any extra or special hardware. The 2 bolts for you power supply are all that's needed. I made sure to leave room so the USB cable can still get connected, as well as cut an sd card slot in, and chamfer edges.
** This was the adapter I got,
** Made a change and opened up the sd card adapter slot for a better fit.
Please post a pic if you print and like!