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Nikko NR-1415 AM Antenna Replacement

I am in the process of a rebuild on a Nikko NR-1415 monster receiver. The only part that I now need is a replacement AM Antenna as the original was broken off. Would anyone know a source for vintage Nikko parts, or, if another more commonly available Nikko receiver's antenna would fit and work on the NR-1415?

Any assistance would be helpful.