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MI Windows use a few different coil balance systems, so the only way to know for sure what you need is to remove your old system and show us. The pivot shoe is especially important, as the identity of the pivot shoe tells us the coil balances you need. If you can show that shoe, we'll do our best to help from there. The video below shows how to remove and replace a certain type of coil balance system, but its principles might help you regardless of what you have.

This is perfect, thanks. You have a 15-180 Pivot Shoe, which uses Series 190 Coil Balances. If the window sash weighs exactly 13.5 pounds, use two of the S190-740 7 pound springs. Use one on each side of the window, for a total of 14 pounds of support (being within a pound of the exact weight works fine). If the support accessories are undamaged you can reuse them, but otherwise see our 15-186 and 15-182.