channel balance attachments

A home owner from california says:
The parts has this markings:

20-4 EH5 CMC 75
User submitted picture of channel balance attachments.
The length is 21" from begin to end of the metal piece. Thanks.
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Tom from SWISCO responded:
Thanks for posting! Before I can offer an applicable replacement for this channel balance, I just need to know a bit more information about the bottom attachment. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment?
A quick learner from california says:
it is 15-004 (it is over 1" deep)
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Tom from SWISCO responded:
Thanks for posting! It appears that you have something like our Series 385 channel balance. Does that look about right? Can you also confirm your metal channel length? I think yours may be 21", but I would like you to confirm.

I would also recommend the 2040 option. This can carry a window sash weight range of 15 through 23 pounds. Does your sash's weight fall within that range?

Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A quick learner from california says:
Correct, it is 21".
I think I will buy a pair as suggested by the web page.
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