How to render an HD file as SD

I recently shot a project on the AF100 at full HD. I framed everything with 4:3 SD in mind knowing it had to be delivered in 720 x 480 for broadcast. In FCP I set the export settings accordingly, choosing "crop" rather than letterbox, but the resulting file does not fill the quicktime window, it has a black stripe on the left side. How do I deliver a 4:3 file?
 
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