Yes, that gear is replaceable. However it is part of a shaft assembly and the shaft is 3/8 of an inch in diameter so I would wonder what caused it to break???
I would be happy to send you that gear but first I think it would be best for you to open the entire assembly to assess the rest of the parts for associated damage.
This would also be the perfect time to replace the plastic gear as shown in the photo with the readily available brass gear available from vendors for less than $50