No identifying marks

A contractor from Charleston, SC says:
Please help identify sash coil spring and bottom attachment for builder grade windows with NO identifying marks. Windows are Vinyl, single hung, home was built around 2000. Thank you for your assistance.
User submitted photos of window hardware.
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Tom from SWISCO responded:
Please see our 15-180 pivot shoe. This may be a good match for you. If you also need the springs, see our Series 190 coil balance.
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