Bedroom Closet doors

My bedroom closet has two doors that open from the middle. The hardware that keeps them closed (on top) no longer functions (broken). On top of the hollow door was a ball type assembly with a spring under the ball to secure the door.The ball has come out and no longer will supply enough preasure to secure the door.I need to replace that cylinder that fits in the top of the door (approx 1" in diamater) The cylinder has a ball on top with a spring under it to keep pressure on it to keep the door closed. Do you have this replacement past?

Thank You,
Robert