both coil springs and shoes for bath window

This looks like a 15-087 Shoe, which uses our Series 180 Coil Balances. The cam is a little different with yours though. Can you show us the pivot bar that fits into that cam? That way I can determine if you're fine using the same pivot bar you have with the new shoe. If the sash weighs exactly 14 lbs, you could use (1) of the S180-7 7 lb springs on both sides of the sash, for a total of 14 lbs of support. 

Hey Gerald. You might have to shave down that bottom point on the pivot bar, but otherwise I see no reason why it wouldn't work with the 15-087, as its pin shape is very similar to the 26-040, which is commonly used with this pivot shoe. Let me know if you have further questions.