Filter Filters Plastic Audi Remove All Filters Price Under $50 (5) Condition New (5) Brand Metra (5) Model A4 (1) S4 (1) Radio Size Double DIN,ISO Mount (2) Single DIN,Double DIN,ISO Mount (2) ISO Mount (1) Audi S4 2002 2003 2004 2005 2006 2007 2008 w Symphony Aftermarket Stereo... $39.95 Audi A4 2000 2001 2002 2003 2004 2005 w Symphony Aftermarket Stereo Harness... $42.99 Metra 99-9105 Double DIN or Single DIN Installation Kit for 2000-2001 Audi A4 $32.29 Metra 99-9107B Double DIN Installation Dash Kit for 2002-08 Audi A4 / S4 -... $25.95 Metra 99-9100 Single DIN Installation Multi Kit for Audi 1997-1999 A4/A6/A8 &... $16.45