Dave Sr. from SWISCO responded:
August 15, 2017
The 38-144 was my first thought, too. I don't think we have anything else that could work. Can you describe the exact difference? I don't see anything at first glance that sticks out. Could it be you need new keepers? Take a look at our 38-277. This is what we use for the 38-144. I know some other window locks like this where the modern replacement isn't compatible with the older keeper, despite having a similar design. I don't know if that's the problem here, but it may be worth considering.
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