I'm not sure if Part# 21-286 is the part I need? I have older Stanley Mirror Bifold doors. In the 1st image the red print Number is 50502962 243554
The part sits in the middle of the Upper & Lower track. Has a spring in the middle of the clip to keep the doors snugg when closed.
Thank you Joe
BTW I have an order placed today. Hopefully I can ass this part