Need Keeper for Slide Latch

A purchasing agent from Holderness NH says:
We are trying to find missing parts for existing hardware on our public toilets. We bought two of these (10-551, Slide Latch) in January, one as a back-up. But I can't tell which Keeper goes with this slide latch.
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Donna from SWISCO responded:
The 10-581 Keeper works with this slide latch and in-swinging doors.
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