CentOS - Mar 2008 - Module i2c-piix4 for lm_sensors on CentOS 5 64 Bit

Hi list,
 Where can i find the i2c-piix4 module for CentOs 5 64 Bit?
 If i say modprobe i2c-piix4 i get the error:
 FATAL: Module i2c_piix4 not found.

 Can you help me?

 Greetings

Sebastian