i am sorry but i am a little confused do i need to get Thermalright AM2 Retention Module for Thermalright or is that just not required on site that i may place order with says "(Both Ultra-120A and Ultra-120 eXtreme do not include a backplate for AM2 systems. If you have motherboard manufactured by either Asrock or Gigabyte that utilizes the push pin method, you will need to make a separate purchase for an AM2 metal backplate.)" i am using msi k9a2-cf-c mobo (ms-7388)