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Tom from SWISCO responded:
August 17, 2017
Let's go back to basics here: I need you to re-measure your balance. It's pretty unlikely that a balance marked "31 3" would measure 31 inches. Measure the metal channel, but don't include the length of the plastic ends. I suspect you will end up with 32 inches, but I could be wrong, so measure carefully.
As far as the stamp option, you simply need to mash up the "31 3" code to get "3130". You can remove and weigh the window to confirm that option. The last thing to verify is the Series 385 identification. Are you sure? Did you measure your shoe? The Series 380 and Series 385 are identical except for the size of the bottom plastic shoe. You'll need to measure the shoe from front to back, as shown below. If you get 1", choose a Series 380. If you get 1-3/32", choose the Series 385. 
Comparison of the S380 and S385 balance shoes.
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