This is the catch that mounts to the window frame which holds the glass. It is designed to allow the window to be pulled in tight so it seals better and does not come open when traveling down the road. These are duplicated exactly like the originals but are made of galvanized steel to help prevent rust. The last 2 photos are for reference only, the part for sale is only the catch. Mounting holes measure roughly 1-3/4 in from center to center.