Replacement spring balances

Thank you for your post. For a replacement coil spring system, it seems you will need our 15-087 pivot shoe, 15-086 tandem coil housing, and 16-024 mounting bracket. This system can be used with the Series 180 coil spring. Your coil should have some sort of stamping or marking on it. You will need that to determine the spring strength needed for the coil. If there is no such stamping, you will need to come back to us with the exact weight of your sash. I am also going to place a couple of videos below showing the different methods on how to remove the system out of the window. 

Lastly for your tilt latches, have a look at our inventory of latches we offer on our website here. See if any of our parts are a match for yours. 

Thank you for getting back to us with your photos. I am afraid your stamping of "516x" does not correspond to which weight option you need for the Series 180. Please get back to us with the exact weight of your sash. This will be the only way to determine which spring strength you will need for your window. As far as the rest of spring system you have, all the other pieces I previously recommended look to be compatible with yours. Have another look at each piece and see what you think. 

For the window with the 19.4 sash weight, you can go with two of the S180-5 on each side of the window. As for the window with the 11 lb. sash weight, you should be good with one of the S180-6 on each side of the window. Have a look and let us know if you have any further questions.