Need both coils for lower bath sash associated material says 4K on coil with pink/red mark on bottom of shoe. Sash 173/4 by 191/2
Tom from SWISCO responded:
November 6, 2019
Your old shoe looks like a match for our 15-177, which itself is compatible with our 1/2" thick Series 152 coil spring. Look these parts over and let me know if you agree.