spring Balance for heavy impact window

A handy person from Florida says:
on one old balance found in attic stamp said
35DS IMP 55L RS
the IMP is imprinted vertically and RS letter on end are much smaller.
@ windows are very heavy one probobly between 50 and 60 LBS
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Tom from SWISCO responded:

We can replace this balance, but it will have to be a special order. Before we begin, can you tell me how many you need? Once I know that, I'll email you an order link and price quote for the desired quantity.

A handy person from Florida says:
Great. Thank you for respond. I guess channel is 0.5"
I need 4 but if special order is not so expensive I may decide to order 2 spare.
Please email the quote.
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Tom from SWISCO responded:

The ordering link will be sent over to you shortly by one of my coworkers. Thanks for writing in!

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