Mullion Clips (to hold mullions in place)

A home owner from Georgia says:
Windows installed in 1988. No idea who made the windows and have never been able to find the plastic replacement clips. White clips, and they break every time we try to remove grids for cleaning. Thank you!
User submitted photos of window hardware.
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Tom from SWISCO responded:
The closest match we've been able to find is our 55-184. Check it out and see if you could use this as a replacement.
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