www.springframework.org is the main site for all the Spring projects/module. You cna download any module from there, so look for the OSGI files.
If you are using
Maven or IVY for dependency management you can go to
http://www.springsource.com/repository/app/search?query=OSGI
the spring repository has OSGI compliant bundles for almost any set of jars you could possibly want.
The link above is a search for the Spring OSGI jars. Select the version you are using below and see what you
Good Luck
Mark