This is a photo of the balance I need

A home owner from Puerto Rico says:
I need several of this balance. The windows are heavy. I recently bougth some but they were so fragiile!! Please help me.
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Bob from SWISCO responded:

Can you show us the nylon fitting on the other end of the balance? From there, we'll do our best to narrow this down for you. 

A home owner from Puerto Rico says:
There are the pics. Let me know if you need more
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Bob from SWISCO responded:

Thanks for getting back to me. If the metal channel, not including the nylon fittings, is 29" long, then you'll need either an S351-29 or S390-29. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware and see what matches best. You'll then need to choose a stamp option, which designates the weight range that the balance is meant to support. The balance in your photos has a stamp option of 2840, which is for a window sash in the weight range of 23 through 28 lbs. If this is the original balance from the windows, then you should be good to go. Let me know if you have any other questions. 

A home owner from Puerto Rico says:
The total length of rhe old one is 30"
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Bob from SWISCO responded:

Do you mean the old one, not including the nylon fittings on either end, is 30" long? If so, does it have a different stamp code on the metal channel (it should). If there's no stamp code, we'll need the exact weight of the window sash. Please confirm it has the same nylon fittings as the balance you show in your photos. If not, we'll need to see the fititngs as well. 

A home owner from Puerto Rico says:

The length of the metal part is 29" and end to end including plastic parts, it is 30". I think the one I need is S351-29 I verified the measurements of the plastic bottom part and it is 1"

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Bob from SWISCO responded:

Thanks for clarifying. Yes, if the metal part is 29" and the shoe depth is 1", then the S351-29 seems right to me. 

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