With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment.
Please note that this type of balance with a 20 5 stamp should have a 21" long metal channel. If that is the case, see the S380-21 or S385-21. If not, I would recommend showing us the end fittings of your 20" balances as well to confirm the correct replacement.
We can also supply your 9" balances but it will have to be a custom order due to the length. If you could confirm if your balances match the S380 or S385, we'll be able to send over an order link and price quote. Thank you!
Great, we just sent over an order link and price quote for the 9" long Series 385 balances you've requested.
As for your balances stamped with 20 5, you would still need to double-check the metal channel length to determine if the stock S385-21 with a 2050 strength option would work for your repair.