Pivot shoe, unkown manufacture.
Hi there. A few options come to mind on a replacement shoe, but before we can make a definitive recommendation, we need to see the pivot shoe completely removed from the window. Once it is removed, we will need to see additional photos of it. We also ask that you remeasure the width, height, and thickness measurements of the shoe to confirm those are accurate. I am also going to place a video below on one of the more common ways to remove a pivot shoe from the window.
Hello! I agree, I think the 15-046 is a great match. Your dimensions line up perfectly. The top is a little different, but it should be fine; both shoes are designed to hold your spiral balance the same way.