32 bit binaries on 64 bit OS? Repo?

Is there a repo setting or similar that's preventing the installation of 32 bit binaries to run with the 64bit OS? CentOS 7.x

E.g - yum install glibc-devel.i686
No package glibc-devel.i686 available.

For context, I need to install the 32 bit binaries to run SourceCMD (See here: SteamCMD - Valve Developer Community recommendation is to simply install the 32 binaries on a 64 bit machine via yum)

So: yum install glibc.i686 libstdc++.i686

Any help much appreciated

Thanks

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So the solution is:

Edit /etc/yum.conf and remove i686 from exclusions and it should work - can also add the exclusion back once upated.