Replacement non-tilt sash block and tackle balance

A home owner from San Jose, CA says:
Could you help me identify what I need to purchase to replace this part?

The stamp looks like it says 29 6. It is a non-tilting MW window. I measure the width of the channel balance at 1/2" and the length at around 29.5".

Thanks for the help!
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for your continued patience. We will be able to replace this part for you, though it will be a custom made part. Before we begin, can you just tell me how many you need? Once I know that, I will send you an order form and price quote.
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