27c window channel balance

Hello,

It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. Based on your 27C stamp code, you'll also need a 2730 spring strength option for your replacement balances. 

Comparison of the S351 and S390 balance shoes.

There's a good chance that we can supply a replacement for your top sash guide as well but we would need to see an undamaged version removed from the window to compare to our inventory. Thank you!