Window risers

A handy person from Jacksonville florida says:
Hello have failed window risers
Window 18 lbs
Metal length 29 inches
Part number 28 3 on Caldwell
Or 29 3 dn Caldwell
Partnumber is obscured
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Emily from SWISCO responded:

Hey there!

Your balance is a match for either our S351-29 or S390-29, depending of the depth of the bottom shoe. The Series 351 has a 1" deep shoe and the Series 390 has a 1-1/8" deep shoe. Measure as shown in the image below to determine the best replacement option. You will also need the 2830 spring strength option for a sash that weighs 16 to 23 pounds.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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