The dev RPMs for 6.0.1 are listed on the development page, but no-one has yet identified and collected together those required for 6.5RC1 yet.
I did have this information for 6.5RC1 some time ago - but thought that maybe only document the final releases (i.e. wait until 6.5 final) as it is likely that there would be some small changes to the versions for each release.