need 2 channel balances.

Thanks for posting. Before I can confirm what Series channel balance you have, I'll have to figure out what your bottom shoe is. Please look at the measurements for our 15-001 and 15-002 bottom shoes and note their depths. As you can see, they are 1-1/8" deep and 1" deep, respectively. Which measurement more closely resembles your own shoe?

Also, are the plastic attachments the same on both balances?

Thank you. With that in mind, please look at our S351-27, which is a 27" Series 351 channel balance. I would also recommend the 2630 stamp option for that. For the other balance, please see our S351-17, with a 1630 stamp option. Let me know what you think!