The org.eclipse.platform zip files were obtained from:

3.x.x:
http://download.eclipse.org/eclipse/downloads/drops/R-3.8-201206081200/download.php?dropFile=org.eclipse.platform-3.8.zip

4.2.2:
http://download.eclipse.org/eclipse/downloads/drops4/R-4.2.2-201302041200/download.php?dropFile=org.eclipse.platform-4.2.2.zip

4.3.1:
http://download.eclipse.org/eclipse/downloads/drops4/R-4.3.1-201309111000/download.php?dropFile=org.eclipse.platform-4.3.1.zip