Sliding Window Balancers

Thanks for writing in! Your balances look like they could be either the Series 380 with a 1" shoe depth or the Series 385 with a 1-3/32" shoe depth. To confirm which series you need, carefully review and compare the dimensions below. 

Comparison of the S380 and S385 balance shoes.

Once you've confirmed the series, you'll need to confirm the length of the metal channel and select it from the list of balances, for the series you need. Then you'll be able to use the stamp from the channel to confirm the stamp option.

I'm happy to help! Be sure that you are only measuring the length of the channel, not including the top and bottom attachment. I've included a video below as a reference to use when confirming the information.

I'm afraid I don't know what else you need to replace on the window since we aren't physically there. What we recommend doing is to inspect the parts in the window for any obvious signs of damage and then replace what is broken. 

Since your balance is stamped 27 4, you'd want to select the 2740 option as you mentioned. 

In addition to channel balances, we've had customers replace top sash guides and take-out clips if they're damaged or are in poor condition. There can be various styles which is why it's important we see photos of the original hardware. I hope this helps.

There are quite a few different top sash guides compatible with the S380-28 Channel Balance. Without seeing photos of the front and side profile views of your customer's guide, I wouldn't be able to identify the exact replacement you need. Unfortunately, the balance nor the photo of the window can help to determine the right replacement.