Pivot Shoe ID

Thanks for posting. This looks like our 15-192 Pivot Shoe. This shoe uses our Series 170 Coil Springs. Look for a stamp number on the coil tape that indicates what spring weight you need to select. If there is none or you are uncertain, weigh your window sash. Give us that exact weight and we'll work out what you need. See the video below for further details. 

Hey there! If your shoe is the only part that broke, then you can absolutely just replace that. The best part about coil balance systems like this is that you can often reuse old hardware with new replacement parts.