Window ballance part

A home owner from USA says:
Hi which part would you reccomend bases off the attached pictures?

The part is 16" end to end. I would like to buy a new one
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
This looks like our Series 700 balance. You'd choose S700-16 if your balance has a 16" metal bar. There is an additional weight option that you'll need to choose before placing an order. Remove and weigh your window sash to choose an option from the chart in the S700-16 webpage product description.
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