Window locks

A quick learner from USA says:
Attached are 4 pictures of locks on my windows. I'm sending 4 so at least 1 of them might show you what I need. I am willing to change the locks altogether, if necessary, to make them actually work. As you can see (hopefully), they are supposed to attach to the windowsill, I guess, but that is nearly impossible. And I'm not sure that would make them secure, anyway. I purchased this house a few years ago, so haven't had working locks since. The locks have the name "Rusco" on them, and I presume they came on the windows, which appear to be retrofitted.

Do you have any suggestions?

Thank you,

Marilyn
User submitted photos of a window lock & keeper.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for posting, Marilyn. Look at our 90-235 lock, which was used by Russco. It could be the one you are looking for.
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