For Reference only:

2005-2007 Cadillac CTS Throttle Body Assembly 12589056 OEM
ALLURE 05-08 Throttle Valve Assm; 3.6L
AZTEK 05 Throttle Valve Assm; 3.6L
CTS 04-07 Throttle Valve Assm; 3.6L
LACROSSE 05-08 Throttle Valve Assm; 3.6L
RENDEZVOUS 04-06 Throttle Valve Assm; 3.6L
SRX 04-06 Throttle Valve Assm; 3.6L
STS 05-07 Throttle Valve Assm; 3.6L

Please make sure item matches your car before you buy.