screws for grid retainers

A quick learner from Nashua, NH says:
What is the screw size for my 55-200 window grid retainers? I do not have enough.
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Bob from SWISCO responded:

I am afraid we don't have an exact screw to recommend for the 55-200, as it depends as much, if not more, on the window that uses it as it does the clip itself. I recommend taking your old fasteners to a hardware store for proper identification. 

55-200 : Window Grid Retainer
Window Grid Retainer
55-200
$1.06
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