Looking for replacement parts

Our house is outfitted with American Mirror Door bi-fold closet doors. A couple of the plastic corner pieces have failed allowing the doors to sag. One of these is used on each door (inner) corner. From what I can find, the American Mirror Door company is no longer in business and I have been unable to find matching plastic pieces on the internet. Do these look familiar to you or do you know where I can source replacements? Thanks. Charlie