Andersen Frenchwood  Hinged  blocker for latch receiver. Has notch / prongs. 

This picture has 7055-54 stamped on it;

Related Andersen Hinge Patio Door Parts:

For Outswing Door:

2579788 - Hook Bolt Receiver:  Head AP / Sill PA 

2579789 - Hook Bolt Receiver:  Head PA / Sill AP 

2579884 - Flush Bolt Receivers: Head PA/Sill AP

2579883 - Flush Bolt Receivers: Head AP/Sill PA

2579402 - Latch Receiver Blocker

2579786 - Lock Mechanism Blocker Cap

For Inswing Door:

2579558 - Hook Bolt Receiver: Upper AP / Lower PA

2579559 - Hook Bolt Receiver: Upper PA/ Lower AP

2579560 -  Flush Bolt Receiver:  Head

2579561 -  Flush Bolt Receiver:  Sill

2579555 - Latch Receiver Blocker Housing:

2579539 - Latch Receiver Blocker  Insert

2579780 - Lock Mechanism Blocker Cap