At the ends of the headliner bows are plastic plugs to better hold the bows in place and prevent damage to the paint. They also neutralize abrasive noise caused by friction while driving.
These caps can only be replaced when a new headliner is mounted, you cannot reach them afterwards. It is therefore recommended to order them with a new headliner and/or new headliner bows.
If you have to shorten (saw) the new bows, deburr them well before putting the caps on, they could tear by the sharp edges.
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