Looks like a S385 Channel Balance. Is It?

Thanks for contacting SWISCO. I agree, that shoe depth looks a little too big for the Series 385. I don't immediately recognize this, but one of my colleagues will. We will get back to you as soon as we know more!

I've actually never seen this, either. I've never come across a bottom balance shoe that's quite as deep as yours. The closest we have is our 15-003, which is 1-3/16" deep, but it has no wings and it's still a little short.

Do you think that will be okay? We can custom make a balance for you with a 19-005 top and 15-003 bottom. If you're interested, let me know how many you need and I can email you an order link and price quote. I'm afraid I can't guarantee if it will work, but we have nothing closer.

The nylon attachments don't hook into anything. The top attachment needs to catch the take-out-clip during removal, and the bottom attachment keeps the balance stable against the sash, but that's about it.

That said, if the shoe is too small then your balance might be loose in the window. I can't really predict what side effects will happen with the kind of difference in size we're working with here. 

A stamp of 26-5 usually corresponds to our 2650 option. You can always weigh your sash and refer to the chart on our S385-27 store page to confirm,

Awesome, I'm glad you got it working! Thank you so much for your business, and for following up with clear details on how you got it to install. I'm certain this will help other customers in the future.