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Tom from SWISCO responded:
August 31, 2017
Hi, John. To start, re-measure your metal channel. Measure only the metal this time. It should come out at 33". I say that because a "32 4" stamp usually indicates a 33" balance with a 3240 option. You can check that by measuring the length the way I described, and then removing and weighing the sliding window sash. It should weigh between 23 and 28 pounds.
Besides the length and option, the other key detail is the balance Series. I can tell (from the "winged" tabs on your plastic pieces) that you have Series 380 or Series 385. The difference lies in a single dimension of the bottom shoe, which I'm going to show you at the bottom of the post. Measure like that, and choose an S385-33 if you get 1-3/32" as a result. If your shoe measures 1", go with S380-33. Should be a 3240 stamp, either way. 
Alternate view of 15-004
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