Availability of previous nightly builds

Hello,

Is it possible to get previous nightly builds of the Eclipse plugin? I
started seeing the NoSuchMethodError in
scala.tools.nsc.ast.parser.MarkupParsers problem with the nightly
updates from May 14th, 15th, and 16th. Thinking the problem was
something else I removed previous versions of the plugin, but would like
to get back to the version from the 12th or 13th. I have already
started using the new collections so I don't believe going back to 2.7.4
is an option.

Thanks,
Tim