Does anyone know where to buy these latches?

[Eric B]

need some help on this topic. I attempted to remove one of my 4 broken latches yesterday with a socket on the nut holding what was left of a latch. The entire bolt was freely spinning and therefore could not get the nut off. What is the trick here? I attempted to use a flat head screw driver to put some pressure on the bolt at a angle but was hesitant about pressure so as not to break the glass.....can I get a little help????