I tried another SD card extender and it worked fine, but I don't like the idea of the micro SD port and the flimsy ribbon cable being exposed where it could be damaged. This extender completely encloses the micro SD port and the ribbon cable. Mounts to the left side rails using the existing electronics box mounting screws. No additional hardware necessary.
The only drawback is this covers up the USB port, which I never use.
Uses this SD extender: https://www.amazon.com/dp/B01D9JIUU0/ref=twister_B06X41WYGM?_encoding=UTF8&psc=1&tag=tv-auto-20
P.S. Thanks to Geoffro for the blower scoop fan cover!
https://www.thingiverse.com/thing:3150741