Window Lock/Latch Replacement or Repair

A quick learner from Wisconsin says:
I have several of these locks/latches that no longer work. They are stamped with the following: 21328A
Can I replace the broken plastic keeper or do I have to replace the whole thing? And, do you have the parts?
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Bob from SWISCO responded:

Thanks for writing in. See our 38-144. This is a newer version of your old lock. You'll need to use a new keeper as well, either the 38-276 or 38-277. Take a look and let us know what you think.

38-144 : Primary Casement Sash Lock, Non-Handed
Primary Casement Sash Lock, Non-Handed
38-144
$10.22
VIEW >
38-276 : Casement Sash Keeper
Casement Sash Keeper
38-276
$2.27
VIEW >
38-277 : Casement Sash Keeper
Casement Sash Keeper
38-277
$2.27
VIEW >
Anatomy of a casement window
Anatomy of a casement window
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