Photo left: Chrome with HDR Switchback HaloPhoto Right: Black with Smoked HDR Switchback Halo The included measurements indicate the OD of the intake flange at the rear. These are designed to fit 4-headlight vehicles with 5.75" headlight systems.This Billet Aluminum Air Intake with optional Halos is the perfect addition to your 575 Headlight kit or as a standalone intake. Now you can create a functional and wicked-looking headlight and intake system. These have been designed and engineered to mount into your existing headlight bucket and trim ring, mounting just like a headlight. With the optional smoked halo, you can match our smoked 575 HDR headlights to retain that blacked-out look.* The 74.5mm intake may require enlarging the hole in the headlight bucket to achieve proper fitment.