A mounting device that enables a contemporary audio/video accessory to be installed in the dashboard of an older model vehicle includes a flange, at least one wall, and a plurality of shoulders. The flange has a rearward-facing surface and an opposite engagement surface configured to engage the dashboard along the perimeter of the opening and to face in the frontward direction. The flange has an inner rim defining an entrance of the channel that is sized to receive the audio/video accessory. At least one wall extends from the engagement surface of the flange, and is sized to be received in the dashboard opening. The shoulders extend in an inward direction from the at least one wall. The shoulders have respective abutment surfaces facing the engagement surface of the flange. The abutment surfaces engage the outer portion of the audio/video accessory when the accessory is inserted into the channel. The abutment surfaces prevent further movement of the audio/video accessory in the frontward direction through the channel. The abutment surfaces are offset from the rearward-facing surface of the flange by a distance of at least 0.25 inch in the frontward direction.