Sash and sash guide

Hello,

If your bottom fitting measures exactly 1" deep, I agree that the S380-37 would be the correct replacement. Your stamp code indicates that you may have a 45-pound window sash. I'd recommend weighing the sash to confirm that is the case. If so, you would need 3670 strength options for your replacement balances, which will support a sash between 42-45 lbs. Take a look and I'll be happy to look into your top sash guide replacement options as soon as the photos come through. 

Your top sash guide resembles the 18-191 pair. Take a look and see how the dimensions below compare to yours. 

Dimensions for 18-191

Alternate view and dimensions for 18-191

It is important to confirm the sash weight since choosing a strength option that is too strong or weak can result in the window not staying up or not closing all the way. If you decide to give the balances a try and run into any issues, our return policy can be found here. The balances and top sash guides can be purchased directly on our product page. You'll be given multiple shipping options and delivery estimates to choose from at checkout. 

Unforutnately, there is no other way to confirm the strength option needed for your replacement balances. Your 36 DS 45 stamp can sometimes indicate that the sash weighs 45 pounds, but it's not a guarantee since different manufacturer's stamp codes vary. The good news is that since the S380-37 (3670) balances are stock items, they can be returned if you realize that the sash weight differs when you go to install them. You're welcome to review our full return policy here.