Lingenfelter offers this 10 bolt 8 rib 3.00� diameter pulley for the CTS-V or Camaro ZL1 LSA 2009-2014 that is the stock diameter OEM pulley.

10 bolt pulley requires the LPE 10 bolt hub sold separately

Lingenfelter CTS-V Camaro ZL1 LSA 3.00 Inch 8 Rib 10 Bolt Pulley Stock Dia 09-14