Hello,
It looks like you have either our S351, with a 15-002 bottom attachment, or S390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. Once you choose the length of your metal channel, you may also need to weigh your bottom sash since the 2290 stamp is from an old weight system that is no longer being used. There is a chart under the product description that tells you what spring strength option to choose based on your window weight.
Thank you!
Comparison of the S351 and S390 balance shoes.
