Anycubic i3 Mega-S Board Fan
thingiverse
I've taken a look at your new design which is a modular fan holder connected to the original screws and the SDCard-Reader-screw sockets: https://www.thingiverse.com/thing:4749832 This is a holder for a stepper-cooling fan, and I took the 60mm fan with screws from my PSU since I replaced the fan in the PSU with a larger one. I've attached the OpenSCad sources for easy customization because my Anycubic doesn't have a bottom enclosure, so the fan has enough room. It's an easy print, just turn it on the flat side and add support from printbed only (probably will print without support too).
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