Antec One (Gaming Series) 3.5 HDD Rail
thingiverse
This is yet another 3.5" HDD mounting rail. It is compatible with Antec's "One" case (and possibly others in their "Gaming Series"). You will need four flat-head (countersunk), 6-32 screws per drive. The length isn't critical, but mine are 3/16" long. Just make sure they don't bottom out in the drive or stick out past the surface of the rails.
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