K&N has an 11" diameter x 1 1/2" tall air filter where the top is part of the air filter. Summit has them. Not cheap, about $100 bucks for an air filter, but you wash it, re-
oil it, and re-use it.
Not a lot of options here. Cobras have minimal carb - hood clearance for air cleaner, and the smaller air cleaners rob HP for restrictive airflow.