tilt latch identification

A quick learner from san anselmo, ca says:
Help id this latch. Viking double hung tilt out lower sash latches on 5 windows broken need replacements. 2 5/8 long 11/16 wide slide in type, no screws, rectanggular top, lower arched back ,white all plastic, slight offset on tongue. numbers on back 7G on bottom center 70 on front, pat. no. 5.139.291 Help!!

Thanks, Rod
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Mike from SWISCO responded:
Rod, can you take a couple photos of your latch and upload them so we can take a look?
A handy person from Colorado says:
I think I'm looking for the same latch. Any success for the previous person?
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Tom from SWISCO responded:
Unfortunately, we never received images. Could you send a few so that we can identify what it is? We will also need to know the distance between the screw holes, center-to-center.
A handy person from Denver, CO says:
I'm sending you a sample today, you should have it by the end of the week.
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