[CentOS] Centos 3.6 or 3.7 CD isos x86_64

Hi - can someone please tell me where I can 
find Centos 3.6 or Centos 3.7 for x86_64? 

On the mirrors, there are directories labeled 
3.6 and 3.7 but it's appears to be a lie. 

All the directories on the mirrors appear to be 
linked to 3.8 (and hence are mislabeled.) 

Thanks! 

-- Ken