Marking on back is R 13 & L 13

A contractor from Atherton California says:
January 17, 2020
I need 3- R13 & 3 L13 parts. This is the latching part that mounts to the window sash of a casement window. Do you recognize this part number. I have no idea of the window manufacturer.
Thanks
Joe
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Dave Sr. from SWISCO responded:
January 21, 2020

Hello there. Look at these keepers from ROTO, the 38-287 and 38-288. See if they match up with what you need.
Roto Striker LH
Roto Striker LH
38-287
$5.24
Roto Striker RH
Roto Striker RH
38-288
$5.24
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