Wanted 1971 GSS Demon six pack air filter

Im looking for a original paper air filter element for a 71 Mr Norms GSS Demon 340 six pack TRI-POWER air cleaner. I cant seem to find one on any of the well known aftermarket sources like K&N, Edelbrock and others so im looking here. Any help would be great i dont have a part # but maybe someone knows of a source, thanks for the free post this is a great site.