Which Option?

A quick learner from Garden Grove, CA says:
I have a 36" x 45" MilGuard sash window with a failed sash balance. I have removed the balance.

The stamp is: 20 4 JQ CALDWELL.

I think I need the S385-21 Option 2040.

Please verify.
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Tom from SWISCO responded:
Yes, usually a stamp of 20 4 corresponds to our 2040 option. However, the only way to verify is for you to weigh your sash and compare that weight to the rating we show for the 2040 option.
A quick learner from Garden Grove says:
Thanks for the quick reply Tom.

OK, I will remove the other sash balance and weigh the window before I place my order.
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