Andersen window molding/glazing

A quick learner from Washington State says:
We are trying to find replacement snap-in exterior grey/terratone glazing for our 1984 Andersen 400 series casement windows (fourth photo shows a close-up) and also replacement molding that appears to be made of plastic and is located between the fixed and casement windows in our home. The windows are placed very close together; this molding fills the space between them, as shown in the first photo. This molding is T-shaped; the third photo above shows the profile with most of the spine (which is at least an inch deep) broken off. I was unable to remove a piece showing the full depth of the spine. The second photo shows the molding in place with the top broken off due to weathering (southern exposure).
Thumbnail of the uploaded file named snap in glazing.jpg
Thumbnail of the uploaded file named molding between windows.jpg
Thumbnail of the uploaded file named t-shaped molding in place.jpg
Thumbnail of the uploaded file named windows from outside.jpg
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Tom from SWISCO responded:

Hello,

It's tough to say for sure, but take a look at our 55-306 glazing bead and see how the dimensions on our product page match up to yours. Thank you!

A quick learner from Washington State says:
Thanks. Do you have any ideas regarding the T-shaped molding between the windows?
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Tom from SWISCO responded:

Unfortunately, we can't supply any kind of framing or molding since that would be specific to the manufacturer. 

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