Multi-point nylon casement window lock

A home owner from Fairbanks, Alaska says:
It seems to be a measuring delema. Mounting holes are 3 1/4 center to center. Fork is 15/16 long from latch base. Lock assembly is 3/4 inch wide over plastic housing, and 4 13/16 Inch overall.
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please start by reviewing the style and dimensions of the 38-177 multi-point lock and 38-178 cover/handle. Let us know what you think and if you have any additional questions. 

Dimensions for 38-177
Dimensions for 38-177

Dimensions for 38-178
Dimensions for 38-178

Anatomy of a casement window
Anatomy of a casement window
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