Tom from SWISCO responded:
August 7, 2017
Thanks for posting. This looks like our S900-17, as long as the outer tube is 3/8" in diameter and 17" long. As for the color tips, those indicate the spring strength. If you don't have a colored tip you will need to weigh your sash on a scale and refer to the chart on our S900-17 store page. You only need to replace what's broken on your window, there's no reason you can't reuse everything else as long as they're functional.
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