The lock body that resides inside the door on this model is the part I need.The spring that pushes the top lock part into the strike plate is broken. This is a Larson all glass storm door, BTW.
Tom from SWISCO responded:
March 30, 2017
I don't know if we have an exact match, but see our 40-194. Could this be a match for your mortise lock? See how the dimensions all match up.