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You will need to fabricate from black polymer filter material used on telescopes for sun observation.  Order a sheet and use the old filter as a template to cut out a replacement filter that fits into filter frame holder. The filters are held ito the frame holder by a plastic retainer ring. Push out. Put sun filter film in and secure back with the plastic retainer ring and you will not believe how nice the sun looks. I have done many Ebbcos and even replaced a Tamaya filter. Causion on the old original sun filters are dangerous so only use for moon ,planets and stars until modified.  https://thousandoaksoptical.com/shop/solar-filters/silver-black-polymer-sheets/