what are the plastic things in the sun visor that you can pull out ?
Not sure this is what you are talking about but I have seen some visors with a built in extension to give you just a little more coverage if needed.
They are to close the gap between the visor and rear veiw mirror when the visor is im the down position.
They also work to block the sun on the side when you move the visors to the door windows.
Good point tennisshoes I totally forgot about using them like that.
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