Abstract: A method of installing an aftermarket head unit for an aftermarket radio in a vehicle. The method includes removing an Original Equipment Manufacturer (OEM) autosound head unit from the vehicle, removing a plurality of OEM knob assemblies from the removed OEM head unit, installing in the vehicle an aftermarket head unit, wherein the aftermarket head unit includes a panel having a plurality of apertures for receiving and engaging the plurality of OEM knob assemblies, and installing each of the plurality of OEM knob assemblies in an individual one of the plurality of apertures of the aftermarket head unit.