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Casey from SWISCO responded:
May 14, 2020
Hello, It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need 2740 spring strength options for your replacement balances. 
Comparison of the S351 and S390 balance shoes.
As for your lock, start by comparing the style and dimensions to our 90-075. I'm not sure what the small piece of black plastic in your photo could be but I'm assuming it's part of a larger assembly. Could you show us an undamaged part and where is installs? Thank you. |
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Casey from SWISCO responded:
May 18, 2020
Hello, We had a new diagram drawn up that will hopefully make the difference in the depth of the S351 and S390 balances more clear.
Comparison of the S351 and S390 balance shoes.
As for the piece of black plastic we were trying to identify, I believe it's a top sash guide. We should be able to replace it, but we will need to see an undamaged guide full removed from the window sash, with dimensions, to compare to our selection. Thank you. |
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Casey from SWISCO responded:
May 19, 2020
The "U" shaped piece of plastic might be a face guide, which, unfortunately, we don't carry in the style you're looking for. As for your balances and sash lock, your total and shipping options will be calculated at checkout. Thanks for posting. |
