Help replacing channel balance

I have BFS windows and I have a broken channel balance that I need to replace. There is no stamp on it. However, it appears to have a 19-005 top and what appears to be a 15-001 shoe (though the shape seems slightly different). The length is 34 inches.

I have attached photos of the channel.

I'd like to replace both sides, since I'm sure it's just a matter of time until the other one fails.

Please help me ascertain which channel I need to order.

Thank you for your help.

My sash is 27 pounds. Ideally I'd like to order 2 (or maybe more) of these, since I"m sure this will not be the last of these to break.

Also, I looked at the other channel balance and the writing on it said "33 9 IW CMC 11" I don't know what that means, but part of it was illegible in the one I took a picture of, so I wanted to share this information.

Thank you for your help.