Coil Balance

Thanks for posting. This looks like a 15-177 Pivot Shoe, which uses Series 152 Coil Balance springs. That '10' stamp implies you need 10 pound springs. Unfortunately we do not carry the Series 152 with that spring weight, but you can use (2) of the S152-5 5 pound springs on each side of the window instead. This will equal 10 pounds of weight on either side, for a total of 20 pounds overall. For new coil housing, see the 15-143, 15-144 and 15-145. These parts 'sandwich' around each coil. Let me know if you have further questions.