Anderson Window ballast

A quick learner from New Jersey says:
I took the ballast out of the window, the marking is E90 9#27 3 84. I have 5 windows and each one needs at least one some of them need both. I assume it is best to replace both for equal tension.

Please tell me which item to order and the cost for them.
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Paul from SWISCO responded:
Based on your stamp of "9#27," I would recommend our 24-939. We also recommend replacing both old balances at once so that no extra strain is put on the new hardware.
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