Our Combination Tail Light with Beacon lamp fits in your current Grimes, Whelen, or other standard incandescent tail light unit. All you have to do is replace your current incandescent lamp with our combination LED lamp and upgrade to LED’s and add a beacon at the same time. This is a completely self-contained lamp with no modifications required. This lamp draws less than .2 amps so it will save you 2 amps in the circuit. No RFI, runs cooler and longer. Available in 12V & 24V. NON-PMA