Premiere CS4 - how to duplicate left audio channel to right

I am editing old footage in which the audio signal is on the left channel only - the right channel is empty. I want to duplicate the left channel on the right so the sound comes out of both speakers. In Premiere 2.0 this was easy: right-click on a clip, choose audio options, then 'Duplicate left', and that was it. I can't figure out how to do the same thing in CS4.

FAQ:How do I create mono/stereo out of stereo/mono audio?
Cheers
Eddie
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