A-S looking for Latch with adjustable holes

A quick learner from Bear, DE says:
Dimensions of large rectangle are 38mm x 27mm. Tab with holes is 19mm x 12mm. Stamp looks like A*S. My window is warped on the bottom sill so I really would like to know if they make these with a tab that has slotted holes so I can adjust the height relative to the cam claw. If not I will probably try to drill holes and will order a few from you in case I screw up.
User submitted photos of a window latch.
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Tom from SWISCO responded:
Thank you for posting. This keeper looks similar to our 90-257, but we do not have this with adjustable screw holes. If you want, take a few pictures of where the window is warping. We may be able to suggest an alternate solution.
A quick learner from Bear, DE says:
I don't have pics but the bottom sill is warped so that it is crowned in the middle. The problem is that over the years, previous owners have caulked the gap on the bottom of the sill so that in order to screw it down from the topside you would need to remove all of the caulk first. If you have any ideas or still think a few pics would be helpful let me know.
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Paul from SWISCO responded:
I've been giving this some thought, and I have an idea. I hate to suggest it, because it's a lot of trouble, but it might be your best bet. First, remove both sashes. You will then have to remove the glass and caulk from the top sash. Try to carefully straighten out the bottom rail, then reinstall glass. Before installing both sashes back in frame, clean out both the top sash and bottom sash interlocks. Hopefully this will solve your problems. You might want some professional help with this project, as it's a bit of a production.
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