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will the 08 tail lights fit perfectly in the 07 trucks or does some modifications need to be done?

 

[Texas6.0]

You will need to swap to the '08 reverse light pigtails/bulbs, $85 from Ford.

 

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have you noticed the lights being any brighter or better vision? and just the reverse light pigtails, not the brake ones ?

 

[Texas6.0]

I didn't notice a change in brightness, maybe a little brighter when backing up at night. And yes, just the reverse pigtails, everything else is exactly the same.