Yes, the lights will fit the 06 F250 Lariat 4x4 . They will not fit on trucks with sealed beam headlights.
Utility grilles are often found on services trucks. These utility grilles are often found on services trucks and in most cases black plastic with a sealed beam headlight. Sealed beam headlights can easily be changed without removing the entire headlight assembly. (The light duty F250 looks like a F150 from this time period, but carried the F250 badge. These trucks are not extremely common, but it still has to be noted that they will not fit those trucks.)
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