Crossbow Balance

A home owner from NASHUA NH says:
Looking to replace the balance system in photos below. All parts or just the white plastic parts. On one of the parts has the us pat #5.737.877. The aluminum rod is 31 3/8 inches long. Thanks for your time.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
This looks like SWISCO product code S870-32 , 32" Series 870 Arrow Balance.
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