40-138 key hole size

A quick learner from Helmet, ca says:
What is the size of the square key hole? I need a knob similar to picture only with a 1/4" square hole. Can you help?
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Dave Sr. from SWISCO responded:
The 40-138 does not have a key hole, I'm afraid. The key cylinder is no longer available. If you want a key lock for you storm door, take a look at our 40-034K instead. It has the same 1-3/4" hole centers as the 40-138, though you will need to drill a hole for the bottom end of the handle.
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