Seem to have misplaced the drive rails for a Cooler Master case.  I have no idea if the size of these are common to other Cooler Master cases or other cases.  They vary a bit after trying a couple that were posted and they did not work.  The key for these is sizing at 12.5mm high and 4.5 mm thick and about 150mm long.   This one does not require screws, simply push the printed pins into the drive and it can't slip out once slipped into the slot.  I Printed these flat to make them as simple as possible.  For me they seem to stay secure, but I did not add a bump to snap into the case so some unlikely potential to move is there.