complete reinstall of yum

I am using FC 6
I  just did  a  build from source (thats what  i  think it is called)
followed the instructions in the "README"   and "INSTALL"
did make and make install  - everything went well .
problem is  i  so much personalised this FC6  ,and i have so much info 
and other modifications that
 i  do mot want to  upgrade to FC-8  from disk(i have them) , rather do 
it the yum way  , but yum cannot work.
Prior to this problem  , i fiddled with the repos.d files etc  , so 
amongst other things can i also retrieve a repos.d file as in the 
origenal from somewhere .
Max