2004 Audi A4 Stereo In-Dash Installation Kits at CARiD Audi A4 / A4 Quattro 2004, Single DIN Black Stereo Dash Kit by Scosche®, with Pocket. Used to install universal stereos which is approximately 7" wide by 2" high. Up yourself and your tunes over the factory installation with.. 2004 Audi A4 Stereo Installation Kit - AutoZone Equip cars, trucks & SUVs with 2004 Audi A4 Stereo Installation Kit from AutoZone. Get Yours Today! We have the best products at the right price.