Widow opener mechanisms

A quick learner from Newmarket, NH says:
July 14, 2019
Trying to identify replacement parts for a double sided window. Need to replace both left and right sides. Inside housing mentions US Patent 450560. Pics of labels are attached.
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Dave Sr. from SWISCO responded:
July 19, 2019

Our best recommendations in a replacement operator for you are our 39-187 and 39-188. Look over the measurements and see if these are a match.
Sash Dyad Crank, 5"
Sash Dyad Crank, 5"
39-187
$37.10
Sash Dyad Crank, 5"
Sash Dyad Crank, 5"
39-188
$37.10
Connecting a casement window operator to stud bracket
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