Mibs for Mainframes

["Desai Daxesh (tel1dxd)" <tel1dxd@ups.com>]

Hello all,
I am currently working towards managing our mainframes.  The last piece is
to get the mib definitions.  This has turned out to be quite a task.
I cannot seem to locate them.  I have opened tickets with AIX and have also
spoken to our IBM rep on-site but to no avail, they remain a mystery.  
Has anyone else managed these and if so could you possibly point me in the
direction to locate the mibs to download.
The model of mainframes we have are the 9672's and 2064's.

Thanks in advance for any help