Official Ninja,
I am very interested in this gear as well. Depending on the price, I would be willing to buy 10 or more of them. (half would be backups). I'm sorry I cannot provide you with a drive, but I could test a gear for you and send it back.
I have a known working drive minus the gear.
If you need measurements, I have a micrometer so I can measure the shaft and gear.
Please keep us posted.