Install specific older version of postgresql centos

I need to rebuild a production system with same version of installed packages.

It's a Centos 5.11 and it was using this repo http://ift.tt/1LuA0ld to install postgresql-server postgresql postgresql-odbc postgresql-plperl postgresql-contrib and postgis.

That repo doesn't exist anymore so I found this http://ift.tt/1An3hww that's versioin 8.3-7 and I need 8.3-6.

I can't seem to find the old version I need on the official website http://ift.tt/1LuA1We

I don't know if old mirrors for the version I want exists or if I need to download each package individually matching the version that was listed on that one repo.