Window part

Question

These are the parts that slide the window up and down.
There is a marking - 2030L BSI
I think the windows are milgard.

I have several windows of different sizes that also need this part replaced.

Thank you so much!

Emily · Accepted Answer

Hello!

It looks like you have either our S351-21, with a 15-002 bottom attachment, or S390-21, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a spring strength option of 2030.

If you have any further questions just let us know!

Comparison of the S351 and S390 balance shoes.