Sliding glass door top plastic

A handy person says:
What?s the plastic part on the top backside of a sliding glass door that holds it from having any play.
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Paul from SWISCO responded:

The nylon piece you are referring to is a guide. Our 86-028 is worth considering. Take a look and let us know if this is the part for you. 

A handy person from California says:
You guys are awesome. That?s what I was looking for. Thank you so very much. You saved me a headache and time.
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Paul from SWISCO responded:

Glad to hear it! Thanks for coming to SWISCO.

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