Part measures approximately 0.5 inch

A quick learner from Mount Dora , Fl says:
Please could you advise the part I need for my window. I have several windows where at this point the casing has become brittle.

Many thanks.

Michael
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Emily from SWISCO responded:

Hi, Michael.

Take a look at our 55-191, 55-194 and 55-206. Look over our dimensions and compare them to yours to see if one of these matches what you need. 

A quick learner from Naples, FL says:
I have what looks like the exact same problem as Michael. However, mine do not feel like vinyl - more like aluminum. The only product I see with the same dimensions by Milestone is vinyl (55-191). Do I just have to use vinyl ones so they won't all be the same?
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Emily from SWISCO responded:

Yes, you can substitute aluminum glazing with vinyl glazing so long as the dimensions and style match up. 

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