23 in channel balance

Hello, thanks for posting! It looks like you could have either our S380-23 or S385-23 with the 2250 stamp option. The difference between the Series 380 and the Series 385 lies in the depth of the shoe. Take a look at the picture below for more detail. Once you have determined this dimension you should be able to select the appropriate balance. In regards to your top sash guide, I will need to see a picture of the part in order to identify a replacement. 

Comparison of the S378, S380 and S385 balance shoes.

Great, thanks for the follow up pictures. I've listed a couple potential replacement parts on the side. Ultimately it's going to come down to the dimensions. The key components to look out for are the width and the location of the screw hole. You can see the full selection here.