Searching for Spring ballance for 15-104 shoe

A quick learner says:
I need the two (missing) ballance springs (in a Caradco window) that are connected at the top to a 19-029 short clip and at the bottom to a 15-104 friction shoe. They fit in an 80 inch tall window and they were 3 to 4 feet in length unstreached. The diameter measures 7/64 within a 5/8 ths channel. see pictures below.
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Casey from SWISCO responded:

Hello,

Unfortunately, we do not carry replacement jamb liners with naked springs used to support old-style windows like yours. Since this is a wood window, a local millwork might be able to supply the parts that you need. I'm sorry that we won't be able to assist with this repair but please let us know if you have any other hardware questions. Thanks for posting. 

Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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