Windows part. Help please

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Hello

What is the name of this windows part please? (The white round piece)

And can I buy separately?? I have 2 brokes in driver door

Thanks!!

 

[challenger6pak]

What you have is a type of nylon washer. If you put metal directly against the glass, the glass would break. Here is one place with a kit.

70-72 E-Body Door window hardware kit(both Doors)

 

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Thank you challenger6pak I ordered a kit right now

 

[challenger6pak]

You are welcome.

 

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Other question please. Its difficult to replace the roller kit??

If can tell me the steps to replace I appreciated a lot of

thanks and best regards