Sash guide?

Question

In taking the window out to replace a broken balancer, I discovered these 2 broken pieces affixed to the window that also need replacing. One of them seems to have M513 stamped on it. Are these sash guides?

Tom · Accepted Answer

At first glance, your top sash guide looks similar in design to our 18-188. I'm just not sure about your dimensions. Look over our measurements and let me know what you think.