OK, you've got a few choices. You can look for another globe in your home store. They have lighting sections and sell replacements for some standard globes. You'll have better luck if you go to commercial lighting store and look for/order a replacement. You can purchase 5 globes similar to the ones you have and replace all five. if you do this, buy an extra one just in case. These lighting fixtures are so mass produced I doubt they even can be identified.