Window balancer

A quick learner from USA says:
I'd like to order 4 series 380 assemblies, but using the 15-029 bottom shoe. Current parts are stamped 2930. Channel metal length is 30".
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Bob from SWISCO responded:

Hello there. I just sent you an email with a custom link to order (4) of these 30" Non-Tilt window Channel Balances, stamped 2930, and with the 19-005 Top and 15-029 Bottom attached. Let me know if you have any questions prior to placing this order. 

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