Window Spring Balance

A quick learner from Jacksonville, FL says:
29 4 CX CMC 11
Metal Channel is 30"
Windows were installed 16 years ago.
The GC was Ryland Homes.
Sub Division is Bartram Springs
Jacksonville, FL

I have 20 windows, probably will order 40 balances if not too expensive.
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Tom from SWISCO responded:

I believe you have a match for our S385-30 channel balance. This comes with a 19-005 top and 15-004 bottom nylon fitting, so as long as the dimensions of these pieces match up to yours then you should be good to go. 

Let me know if you had any questions.

A quick learner from Jacksonville, FL says:
what stamp option do i need?
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Tom from SWISCO responded:

Based on your old stamp of 29 4, you'd want the 2940 option.

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