Mullion tension clip

A quick learner from USA says:
Hello;
I am looking to replace damaged or lost aluminum (I think) clips on the mullions (perhaps it's called a "door grill"?) on my sliding porch doors.
Can you help me?
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A quick learner from USA says:
Hi again, Swisco: in response to "support" of a few minutes ago, here is a closeup photo of the fastener I'm currently using. Do you stock these? Do they come in different sizes? Is there an alternative that would do a better job?
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Lauren from SWISCO responded:

Hello, thank you for posting,

Unfortunately we do not have an exact match for this style of clip. The best we can offer is a style like the 55-176, but we cannot guarantee the same fit. Please review to see what you think! 

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