29 " Shaft/Tube and 3/8 Inch diameter--What part number will have this clip?

A handy person from arizona says:
29" Shaft/Tube, 3/8" Dia--Plese let me know what part number I should order to match the clip as shown.
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Tom from SWISCO responded:

I believe we can help with this balance, but it will have to be a special order  due to its configuration. Before we go any further, can you tell me the weight of the sash and how many of these balances you need? 

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Tom from SWISCO responded:

Hello again! After looking into this some more, we will also need to know the length of the internal spiral rod. Since your tube is 29" long, the rod should be either 30" or 31". Let me know!

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