Replacement Storm Door Mortise Latch

A handy person from Kingstree Sc says:
I need the replacement Inside Mortise Latch for a Pella Storm Door Model 90975 8910. It looks like the 40 - 198 or the 40 - 194. I can get measurments tonight, but if you could determine by the Door Model number , I could order today instead of tomorrow.
Thanks, Randy
A handy person from Kingstree Sc says:
From the pics of 40-198 and 40-194, it appears the dimensions are the same. How can I differentiate between the two if you cannot determine which by the door model #?
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Tom from SWISCO responded:
Thanks for contacting us. The biggest difference between the two mortise locks is that the 40-194 has a large lightbulb-shaped hole for a key cylinder, while the 40-198 has a small slot for a spindle. Carefully look over the style of each mortise lock, not just the dimensions, and see which type is closer to your own.
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