#10 Metal Zipper Retainer Box and Zipper Insertion pin,Bottom Stops Zipper Repair Kits Replacement,Metal Latch Sliders
It fits for coats, jeans, skirts, slacks, purses, sweatshirts and jackets, down jackets etc.

How to install the zipper replacement:
If the insertion pin or box pin (the other half) of the zipper is missing, you should replace the zipper.
However, if you have one set new zipper retainer box and zipper insertion pin that will fit the box and slider of the zipper being repaired, carefully remove the pin, align it on the tape portion at zipper bottom, crimp it tightly with pliers, add a drop of super-glue and let dry for 15-20 minutes.
You now have a repaired zipper.
This works on metal insertion pins only. Nylon zippers cannot be repaired this way.

Note: make sure your zipper type and size before you buy the zipper replacement.