Update: Unfortunately Chamberdoor does not sell hinges even though it's pretty simple to replace them. They do sell the Z Bar but with shipping it's almost $100. These hinges were not sold at either the big orange box or the big green box. I ordered online and fortunately what I ordered I was able to make work. I bought a pin kit and the only issue was my hinge had some casting flash so the nylon pin wouldn't slide in. A 5/16 drill was the perfect size to remove it. None of these hinge kits or pin kits have an application or brand listed. Most of them do list dimensions so if you disassemble you should be able to get the right kit. If I were to do this again I would remove the door take out the hinge measure it and then order based on the measurements. 
This door is starting to sag, when it closes it hits the other door near the top. It looks like the hinge has worn out. I was at the big box store and I didn't see any replacement hinges so I'm thinking the hinge is integral to the frame. Is there any way this can be fixed. If it was just the single door I wouldn't mind replacing it but not likely I can find this same door five years later.
Best Answer
No easy way to replace the hinge? Is much cheaper than replacing the entire door that will take the same steps to disassemble. I would remove the door from the hinge then pull the frame then the hinge can be replaced it won’t be simple but hinges will be much cheaper than the entire door. Just take the hinge with you and match the size. I have replaced aluminum hinges like these with steel ones I did paint the steel to match the door prior to installing this saved me a lot but did take a couple hours to complete.