I think you call this snap in glazing....

A quick learner from FL says:
Dimensions
LXW 28 1/2" X 33" Depth 1/4"
How do I order this?
Thank You
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Bob from SWISCO responded:

Yes, that looks like glazing bead to me. To know what replacement you might need, you'll need to remove a sample and show us its end profile. That cross-section view should help narrow down the selection. See the video below that shows how to remove and replace snap-in glazing bead. 

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