FEC,
The best advice I could give you would be to keep a close eye on ebay. You'll find one sooner or later. I am really suprised that Jeff and John didn't have what you are looking for. They seem to have just about anything. This link might be of some help to you:
www.postwarlionel.com
There is a link to a guy who sells parts in the Advertiser's section on the main page.
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