Window balances

I have Kinco windows that were installed when my house was built in 1978. Kinco is no longer in business and I need to find replacement balances. Do your balances fit Kinco windows? I looked at the balances online, and the top of the 19-008 balance looks about right, but I don't recognize any of the shoes. I have a channel balance with 2040 on it. I have several more that are different sizes, but first I want to see if they will fit my windows. I have always replaced them myself, so I just need the parts.

I removed one of the balances and tried to take close up shots. The marking on the balance is 2040P; there are no markings on the window. I have other sized windows, so it you have this one, I will remove one of the balances from the larger windows to see the markings on them.

Thanks for your help.

Audrey

Is there any other information you could need beside the depth of the balance shoe? I have to take the window out each time to get to the balance and it's quite heavy since it is double-paned. I'd like to be able to get all the info needed while it is out.

The shoe is 1 inch deep and 1 inch long. The channel is 1/2 inch wide and 9/16 inch deep. The only marking on the channel was 2040.

Thank you. I will order a pair of them to see if they work. The bottom shoe doesn't look like mine, but then again the style might have changed since the late 70's.