If you are talking about the ones on a 1957 you need to install them with the fenders off. I contact cemented mine on, and it wouldn`t hurt to use some black zip ties over that to ensure they stay glued down.
They are shown "View C", but haven't found anything yet that describes their installation process. I think gluing them between the two tubes would be the way to go. Would you use contact cement as suggested or 3M Super Weatherstrip Adhesive?
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