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Oval trailer lights take a pounding from vibration and road impact, and a grommet does a lot of the work in keeping the lamp intact over time. This Peterson 421-18 grommet flush-mounts 6.5-inch oval lights and adds a layer of shock absorption between the lamp and the trailer body.
A worn or missing grommet leaves a light exposed to every bump in the road - this one restores a secure, cushioned mount for your oval lamp.