QSA 2" Drop Spindles. Compatible with 2007-2016 GMC Sierra 1500 2WD / 4WD / AWD (CAST STEEL CONTROL ARMS ONLY!) See Description Below for applications (2007-2014 1500 Models) Note: Must have Classic NBS if year 2014. Includes 1 set of 2" Drop Spindles (L+R). Comes with a Full Manufacturer's Warranty! Fits Models with CAST Steel Control Arms ONLY!! Does NOT Fit Models with Aluminum or Stamped Steel Control Arms! High Quality Ductile Iron Castings Wheels 17" or Larger Recommended (Minor modification required for 17" rims -- Contact for details)