✔OE# UF569. Replace# C1555, 12618542, D508C, D515C, 3340078J01, 3340078J02, 5C1612, 12632479. Not included instruction manual, spark plug & screws are NOT included. Easy to install. ✔For Buick: 10-18 Enclave丨10-16 LaCrosse 3.6L丨2010 Allure 3.0L/3.6L丨2010 LaCrosse 3.0L. For Cadillac: 13-16 ATS 3.6L丨10-15 CTS 3.6L丨10-13 CTS 3.0L丨08-09 CTS 3.6L丨12-16 SRX丨10-11 SRX 3.0L丨07-08 SRX 3.6L丨2011 STS丨2010 STS 3.6L丨13-19 XTS.