Tom from SWISCO responded:
August 7, 2017
I believe your top sash guide is our 18-188. As with all of our parts, please check the dimensions against what you have before you place an order. The balance looks like it may be our S351-29 with a 2810 stamp option, but you'll have to double check the measurements of the 15-002 shoe and 19-002 top, which come with the Series 351 balances.
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