They just snapped into place. There is no glue included so I hope they stay. There is an upper and a lower part (the lower one is wider. I found out from other reviews). I used these without the billet grille because I've heard others cause airflow/performance losses. Logical. Some info said they wouldn't work on a Rubicon, but mine is a 2017 and didn't have any other inserts in the grill slots. Very happy with their looks and price. I just pasted them today so I'll update them if they don't stay.
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