Hard to find! This is a Downey Offroad air filter. Filter will need to be replaced. Downey was a premier Jeep/Land Cruiser/Offroad shop back in the day that made high quality products. Fits F and 2F gas engines with Holley carbs. This will NOT fit the OEM Aisin carbs.
For new filters, the manufacturer wrote this: "The filter element is K&N #E-1050. It is 9" round by 2" tall. It is supplied round, then you push in the two sides to make it oval. The Downey housing then holds it into the oval shape"
Image shows the description from an original Downey catalog.