I would never buy anything for my cars again at Autozone. I, too, bought Duralast ball joints. The two had the same part numbers, different boxes, made in different countries, and one had a grease zerk/one didn't. I wanted to without the grease zerk based on feedback here that said it was a better quality part; that, and the OEMs didn't have a grease zerk either and lasted >100k. Autozone couldn't guaranatee to get two identical parts, but ordered two more anyway. They came in different again, so they paired up the ones I wanted.
When it came to install, the driver side installed ok, but the passenger side would not go in pair enough to allow the clip to go in. So, one side still has the original ball joint, but it looked to be in good condition anyway.
JNZ will tell you you can't get Mitsu front ball joints anymore; you'd have to get the whole control arm with the ball joint pre-installed. But, others here mentioned you can buy a rear ball joint and it's the same part as the front without having to buy a control arm. I would've done this had I known.