Window latch for old single hung window

A home owner from Vero Beach, Florida says:
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Casey from SWISCO responded:

Hello,

We'd be happy to help but we would need to know the exact distance between the center of the installation holes in your lock to narrow down your repalcement options. Thank you!

A home owner from Vero Beach, Florida says:
The distance between the screw holes is one and one half inches. The plate that the latch goes in to is a flat piece of metal, and it screws into the fixed upper window on the vertical plane. It is less thick than a piece of carboard So, there is very little space between the fixed upper window and the lower window as they are flush when locked.
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Casey from SWISCO responded:

Take a look and compare the specifications of our 90-021 lock and hole spacing of the 90-283keeper to your original assembly. Thanks for posting! 

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