Need to identify Part Upper Coil Spring and Lower Track Pair

Thanks for posting, Jeff. I'm told by my pal Steve that you're going to try to remove this shoe from the window. I'm also told you were looking at our 15-141 as a possible replacement. I agree that this looks similar, but seeing it out of the window would definitely help us confirm. The 15-141 pivot shoe is compatible with our Series 150 coil spring.