Spiral balance tilt window parts

A contractor from 72560 says:

We are reworking some windows for a customer. The 3/8 spiral balance are 21", green tip (see pic of green piece) I only see blue in 21". Will blue have enough strength for these windows?

Also, we need some shoes (see pictures). Size is 1 1/4" wide, 9/16" deep, 1 3/4" tall. I don't see anything this size. According to the customer they are Danvid windows, about 2001. What would you suggest. I don't see any that are 1 3/4 tall. Everything seems to be 2" or so.

Tell me what you suggest about 21" spiral bal and what shoe to use

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Emily from SWISCO responded:

Hello!

If your spiral balance has a diameter of 3/8", see our S900-21 and 15-219 pivot shoe. Compare our dimensions to yours and see if this matches what you need. Your tip color is faded a bit so we suggest weighing your sash on a scale to determine the appropriate color option. There's a chart on the S900's store page that will show you which option you'll need based on the weight of your sash. 

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