I believe what I thought was a broken belt was the seal that comes in the agitator dog kit just kinda hanging there.
If you found it under the washer it is not the seal that comes in the agitator dog kit.
Could you post a photo of it?
Should I worry about that too or just put in a new motor coupling?
Put the new coupling on and give it a try.
ultimate care II
Not a model number. The model number can be found on the model/serial number tag under your washer lid.
Could you look for the model number and then post it here, thanks.