Yeah, late to the game - just discovered Acard makes a 2.5" SATA-to-50-pin SCSI adapter box that is the physical size of a 3.5" drive.
Thus, throw in your laptop drive (or SSD!) and get a conventional-3.5"-drive-size with 50-pin SCSI drive. If it wasn't $250, I'd snap a couple up!
Although I love that one of the selling points is "use cheap SATA drive with legacy equipment!" Uh, it's not that cheap once you add in the adapter! (But yeah, if you have an old industrial system that MUST keep running, it's cheaper than replacing the system.)