Help! Barrel for a 841 movement

Hello. Warm greetings! I was hoping that somebody in this great forum could help me find a barrel with complete main spring for a 841 movement. I would really appreciate your help. I got a 841B and it was too big so I was told that the one that I am looking for is the one without the B so it is the smaller one. If any one has one or a complete 841 movement, please let me know. Thank you very much and please have a great day !!