Searching for 28-5 EA2 CMC12

It sounds like you are looking for a replacement channel balance. You are in luck. We offer a number of different balances that could work for you. To get started, we need to see some detailed photos of the balance removed from the window. Make sure to include the top and bottom plastic nylon pieces. We'd also need to know the metal length measurement of the balance along with the channel width. Once we have that, we will go from there and begin searching for a match. 

This is a Series 395 balance, if I'm seeing it correctly. It should have plastic wings on top and none on the bottom. If so, select S395-29 with a 2850 stamp option! You can place an order right from the product webpage.