Plastic mullion clip t

A home owner from Suffolk, Va says:
Looking for plastic clip to hold wooden mullion manufactured by Webb Mfg in early 70's for use with Anderson Narrowline double hung window. Clip has 5/8 inner width; height is 3/8
User submitted a photo of a grille clip.
Profile picture of Paul
Paul from SWISCO responded:
How about our 55-184 grid clip? Could this be what you're looking for?
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