Curved shower door replacement bottom guildes

I have a shower door which doesn't seem to have any manufacture markings. The curved doors which open and close have rollers on the top and guildes on the bottom. They seem to be offset grey plastic with quarter turn plastic pieces which hook into the aluminum track to retain the bottom of the door. Someone has tried to replace the broken piece with a screw and washer to help retain the bottom, but it didn't work. Can anyone identify the manufacture and/or solution to solve the issue. I would hate to replace the whole assembly to solve this issue.