get default rpms on RH4 for Oracle 9i

Hi all,
please advise.

i need to install Oracle 9i database on RHES4 and i've totally screwed up with RPMs trying to install the wrong (i386) on 64bit machine.
my question is: how do i can get back to the whole default bunch of RPMs and start from the beginning?

rpm -e bad-package
rpm -ivh /path/to/installation/media/RedHat/RPMS/bad-package.good_arch.rpm

Could you post a list of affected RPMs - incase there are any special considerations.

Cheers,
ZB