QSA 2" Drop Spindles. Compatible with 1999-2007 GMC Sierra 1500 2WD / 4WD / AWD (2007 MUST have Classic Body Style) See Description Below for applications (Note: Must have Classic NBS if year 2007.) Includes 1 set of 2" Drop Spindles (L+R). Comes with a Full Manufacturer's Warranty! Direct Bolt On High Quality Ductile Iron Castings Wheels 17" or Larger Recommended (Minor modification required for 17" rims -- Contact for details)