Tom from SWISCO responded:
September 21, 2017
Judging by the photos and the length that you listed, this appears to be S770-34. Look that part over carefully to make sure it is, in fact, what you need. You'll need to know the "option" to place an order, which is determined by the weight of the sliding window sash. Remove it, weigh it, and compare the weight to the chart on the S770-34 item webpage. The chart can be found in the product description.
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