Get another piece of metal and make a whole new one or make a new side with a hole in it to screw it in the center. There should be a hole there anyways. If you live near a junk yard you could buy another one there. Id probably do the last one.
Mine did the same thing. I still had one strap on each side so I stripped the paper off two bread ties and used them to hold the bulb in place and they helped make the connection. Just a quick temp repair.