Oh, sorry for the misunderstanding.
That is VERY odd they would fit in the rear of a 2010 and not a 2012. Honestly man just contact quadratec, tell them your issue, and they'll pay for the shipping to return the item. I've dealt with Quadratec a ton (always my go to source) and they are great in regards to returns and exchanges..
2009 Wrangler Sport JKU: 35" Mickey Thompson MTZ/17" Pro Comp Xtreme Wheels/ 3" BDS Lift/4:88 gears/ARB Lockers/ARB Air Compressor/Rugged Ridge Front Bumper/ Rugged Ridge 8500lb Winch/Cold Air Intake/Borla Dual Exhaust/Tuffy Underseat Security and Trunk Enclosure/etc. etc. etc.