Virgo has a single p2 repository that contains all Virgo distributions. The repository for version 3.6.4.RELEASE can be found here. There is a repository for each released version.
As shown in Section 3.2, “Installing with the p2 director from Eclipse” you can easily install VTS in a desired destination. The only director argument that needs to be adjusted is -installIU.
For VTS the right value is tomcat-server.product.