The deltapack zip files were obtained from:

http://download.eclipse.org/eclipse/downloads/drops/R-3.7.2-201202080800/download.php?dropFile=eclipse-3.7.2-delta-pack.zip
http://download.eclipse.org/eclipse/downloads/drops4/R-4.2.2-201302041200/download.php?dropFile=eclipse-4.2.2-delta-pack.zip
http://download.eclipse.org/eclipse/downloads/drops4/R-4.3.1-201309111000/download.php?dropFile=eclipse-4.3.1-delta-pack.zip

The zip files include the sources.