Need help finding

I need help finding the top replacement part for my patio door. I've ordered the other one shown in the pictures, but the one end is slightly bigger and also the screw holes don't match. I've gone to every big box store and even bought replacement rollers to use. They also don't have the right size pins. I'm completely lost at this point. I've contacted the manufacturer and they don't sell to the public. They pointed me in your direction. Any help with this would be greatly appreciated.

Brandon