Replacement non-tilting window channel balance

Hello,

I agree that your balance looks like a match to the S385-26 with a 2540 strength option. Please note that the bottom fitting measures 1-3/32" as shown below but it is not uncommon for the shoe to wear down a bit over time with regular use, which would account for your slightly smaller depth measurement. 

Close up view of the S385 balance shoe.

As for the mystery piece that you found, I suspect that it may be a piece of a top sash guide, which would install on the top corners of the sash frame to hold the channel balance in place. If so, we would need to see an undamaged version removed from the other side or an identical window to compare to our inventory. Thank you! 

I'm sorry to hear that. We've had a few smokey days on the East Coast as well due to the fires in Canada. Not the best conditions to be doing home repairs. 

As for your top sash guide, I agree that yours looks like a match to the 18-008H as long as the dimensions below match up to yours. 

Dimenisons for 18-008H