Found it! Stern 1 bank drop target reset plunger and plate

[PinballDaze]

As per long title.
Part number is 530-5757-00.
The plunger is drilled at the bottom and a striker/actuator is attached to reset the drop target.
Mine has sheared and plate is AWOL too.
Payment or swap for other parts (I have modern Stern parts).
Pics attached.

 

[PinballDaze]

Thanks to Ed Emms for getting this welded for me