Wndows Balancers 2830

A home owner from Ponce, Puerto Rico says:
I need six windows balances 2830 for replace those are broken in fourteen years of use. In Puerto Rico, I do not get the part. The part number 2830 does not match with yours series. I need your help for identify the correct part number and put my orders
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. 2830 only indicates how strong the spring is. The Series is determined by the nylon attachments on either end of the balance. You either have our Series 390 or Series 351 depending on the depth of the bottom nylon attachment.
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