Your search for custom car speaker box returned the following:

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Medium oak)

• medium oak Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Graphite)

LOW STOCK

5 people say 

• graphite Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Graphite)

• graphite Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Medium gray)

LOW STOCK

5 people say 

• medium gray Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Medium gray)

• medium gray Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Blue)

5 people say 

• blue Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (1999-2002, Blue)

• blue Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Dark charcoal)

LOW STOCK

5 people say 

• dark charcoal Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Dark charcoal)

• dark charcoal Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Tan)

LOW STOCK

5 people say 

• tan Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Tan)

• tan Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Driver side custom-fit enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Pewter)

LOW STOCK

5 people say 

• pewter Stealthbox® enclosure fits driver side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 10" W6v2 subwoofer Fits 1999-2005 Chevrolet Silverado / GMC Sierra Extended Cab (with full-bench rear seat) (2003-2005, Pewter)

LOW STOCK

• pewter Stealthbox® enclosure fits passenger side underneath the rear full-bench seat
• one 10" W6v2 subwoofer
• power handling: 150-600W RMS
  

Custom-fit fiberglass enclosure with 12" W3v3-2 sub — fits 1999-2002 Chevy Silverado /GMC Sierra Extended Cab models (2003-2005, Dark charcoal)

2 people say 

• dark charcoal Stealthbox® enclosure installs under driver side rear seat
• one 12" W3v3 4-ohm subwoofer
• power handling: 100-500W RMS
  

Custom-fit fiberglass enclosure with 12" W3v3-2 sub — fits 1999-2002 Chevy Silverado /GMC Sierra Extended Cab models (2003-2005, Tan)

2 people say 

• tan Stealthbox® enclosure installs under driver side rear seat
• one 12" W3v3 4-ohm subwoofer
• power handling: 100-500W RMS
  

Custom-fit fiberglass enclosure with 12" W3v3-2 sub — fits 1999-2002 Chevy Silverado /GMC Sierra Extended Cab models (2003-2005, Pewter)

LOW STOCK

2 people say 

• pewter Stealthbox® enclosure installs under driver side rear seat
• one 12" W3v3 4-ohm subwoofer
• power handling: 100-500W RMS
  

Custom-fit fiberglass enclosure with two 10" W1v2 subwoofers Fits 2005-up Toyota Tacoma Double Cab

LOW STOCK

4 people say 

• Stealthbox® enclosure fits behind rear passenger side seat
• two 10" W1v2 subwoofers
• power handling: 100-600W RMS
  

Custom-fit ported fiberglass enclosure with 10" W3v3 subwoofer Fits 2004-up Ford F-150 SuperCab and SuperCrew trucks (Black (matches leather interior))

LOW STOCK

5 people say 

• black Stealthbox® enclosure fits under driver side rear seat
• one 10" W3v3 subwoofer
• power handling: 100-500W RMS
  

Custom-fit ported fiberglass enclosure with 10" W3v3 subwoofer Fits 2004-up Ford F-150 SuperCab and SuperCrew trucks (Black (matches cloth interior))

5 people say 

• dark gray Stealthbox® enclosure fits under the rear seat on the driver side
• one 10" W3v3 subwoofer
• power handling: 100-500W RMS
  

Custom-fit ported fiberglass enclosure with 10" W3v3 subwoofer Fits 2004-up Ford F-150 SuperCab and SuperCrew trucks (Dark flint)

5 people say 

• dark flint Stealthbox® enclosure fits under driver side rear seat
• one 10" W3v3 subwoofer
• power handling: 100-500W RMS