Drawer rear mount

Thank you for your patience in this matter. Unfortunately, we do not have a replacement for this rear drawer bracket. I don't think this style is made anymore. We could recommend a solution, but it'd require replacing the whole track system. If you don't want to go through all that, I'd recommend contacting the original makers of the cabinet to see if they can still provide this. 

Let me know if you want to go with a new track system, though. I'd be more than happy to walk you through it. I'd like a photo of your existing track just to be sure you have what I think you have, though. You can never be too safe.