Window balance for aluminum windows

A quick learner says:
I need to find some window balances for aluminum windows. House built in 1967.
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Tom from SWISCO responded:

We can replace this balance, but it will have to be a special order due to its unique configuration of nylon attachments. We would be using our 19-004 top and 15-031 bottom.

Before we begin, can you tell me the length of the metal channel and the stamp printed on it? Can you also tell me how many you need?

Once I have this information, I'll email you an order link and price quote for the requested quantity. 

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