open-vm-tools may be a solution. The kmod package included is kABI-tracking.
http://people.centos.org/hughesjr/open-vm-tools/
Johnny Hughes has been providing it since early 2008. I don't remember if he announced it at some point.
The last version there is dated Oct 2008. I tried to build the current version but encountered a (minor?) issue with one kernel module that was added recently. I then started working on the issue with Alan Bartlett. However, I halted the plan thinking this did not have a high demand and, therefore, cannot be given a high priority.
http://packages.vmware.com/tools/esx/4.0/rhel5/
Vmware is providing current packages now... jlc