Rear air cleaner lite bars for Peterbilt 388 models are designed to accentuate the air cleaners with mirror-like stainless steel lites. They are available for both standard or premium air cleaners. In order to properly install the lite bars, check whether your air cleaner has a standard or premium can. If unsure check where the cover meets the can, if there is a flange, you have a STANDARD CAN, if it is flat with no flange, you have a PREMIUM CAN. Lites are red, but are available in both a clear lens and red lens.