where to download postgresql-server-7.2.2-1.i386.rpm?

i am installing opennms:
[root(at)jhxz OpenNMS]# rpm -ivh opennms-1.2.8-1_rhl8.i386.rpm
opennms-webapp-1.2.8-1_rhl8.i386.rpm
warning: opennms-1.2.8-1_rhl8.i386.rpm: V3 DSA signature: NOKEY, key ID
4c4cbbd9
error: Failed dependencies:
postgresql-server >= 7.2 is needed by opennms-1.2.8-1_rhl8
Suggested resolutions:
postgresql-server-7.2.2-1.i386.rpm
[root(at)jhxz OpenNMS]#

it seems that postgresql-server is requried for me to install opennms
I ask my system what post are in:
[root(at)jhxz root]# rpm -qa | grep stgr
postgresql-python-7.2.2-1
postgresql-odbc-7.2.2-1
postgresql-perl-7.2.2-1
postgresql-devel-7.2.2-1
postgresql-libs-7.2.2-1
postgresql-jdbc-8.0.8-1PGDG
postgresql-tcl-7.2.2-1
qt-PostgreSQL-3.0.5-17
[root(at)jhxz root]#

no postgresql-server here, and then i google postgresql-server and
found no 7.2.2 downloadable.
i download a postgresql-server-7.3.14-1PGDG.i686.rpm and install it:
[root(at)jhxz postgresql]# rpm -ivh
postgresql-server-7.3.14-1PGDG.i686.rpm
warning: postgresql-server-7.3.14-1PGDG.i686.rpm: V3 DSA signature:
NOKEY, key ID 748f7d0e
error: Failed dependencies:
libcrypto.so.4 is needed by postgresql-server-7.3.14-1PGDG
libpq.so.3 is needed by postgresql-server-7.3.14-1PGDG
libssl.so.4 is needed by postgresql-server-7.3.14-1PGDG
postgresql = 7.3.14 is needed by postgresql-server-7.3.14-1PGDG
[root(at)jhxz postgresql]#
So many softs are required! and among them is postgresql7.3.14,
so i could only install postgresql-server-7.2.2-1.i386.rpm to work with
my postgresql7.2.2-1,
nothing else can do.

Question 1: where can i download postgresql-server-7.2.2-1.i386.rpm or
srpm?
Question 2: do i really need postgresql-server-7.2.2?
if not, could i force opennms to be installed with the following
command?
rpm -ivh -nodeps opennms-1.2.8-1_rhl8.i386.rpm
opennms-webapp-1.2.8-1_rhl8.i386.rpm