In case you have missed it you can download all your tax forms and guides from SARS' efiling website. Just click on the "Forms and Guides" link.
For your assistance:
Employers: IRP511 and guide
Companies: IT14 and guide
Trusts: IT12TR, guide, and schedule
Exempt Institutions: IT12EI, and guide
Individuals: Forms and guides
(There are also Afrikaans forms and guides available on the site)