PADO storm door lock
A quick learner from Pennsylvania says:
August 25, 2013
The lock on the inside of the door has the word PADO at the top and at the bottom has the word LATAO. The inside of the lock plate mechanism measures 3/4" and the outside and inside plate measures 1".
Dave from SWISCO responded:
August 27, 2013
You might want to start by looking at our 40-049. Does this look like it could work for you? If not, could you take a few pictures of your existing handle set and upload them here for us to see? I would also need detailed dimensions.