Pella Sliding Patio Screen Corner Fitting

I have damaged my Pella sliding patio screen frame. The screen frame is 4 ft x 8 ft and the frame members are 1 1/2 inches wide and appear to be aluminum extrusions with a plastic corner fitting inserted. Can this corner fitting be replaced and do you have such a part? The part has not been removed so I have no additional photos. The extrusion members measure approx 1/2 think and 1 1/2 wide

The door has not been disassembled so no picture of the fitting is available. Pella was of zero help. I assume it is a corner fitting similar to a screen corner but could not tell. I made a repair with an angle bracket and some binding posts. Functional