Depth of the keeper

A landlord from New York says:
What is the depth of the smaller piece in the 90-173 set? The lock is OK but the depth of the ledge on the upper part of the double hung is only 1/4". Need to know if that would fit.
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Paul Sr. from SWISCO responded:
The depth of the 90-173 window keeper is 9/32" at the base and 1/4" at the top.
Depth measurements of the 90-173 window replacement keeper.
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