The one in the pics is 28inches overall and the metal is 27 inches long the metal is approximately 5/8 inch on all 3 sides. The plastic piece on the one end is approximately 1 3/32 wide. I will need 8 of these.
I also need the same thing except the length is 21 inches on the metal and 22 inches over all. There is no markings on these. The plastic on the end is 1 and 3/32 as are the others measured from out sides.
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Emily from SWISCO responded:
October 23, 2023
Hello there! If the bottom fitting for your balance measures 1-3/32" deep then you'd want the Series 385. If there aren't any stamps, you will need to weigh the window sash on a scale to determine the spring strength option. There's a chart under the product description on the Series 385 store page that will tell you which is best based on the weight of the window sash. Let us know if you have any other questions! 
Comparison of the S380 and S385 balance shoes.
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