I'm not sure there is anything, or if you'd want to cover it all the way because wouldn't that affect the airflow? I use CE3 bottom coils and the tapered shorty cones.
A big bore cone will cover about 2/3rds of the CE3, but that's it.
As Clovery stated, the air flow is effected, but not as bad as a regular cone.
I have seen where ppl have drilled holes in the side or even enlarged the end of there standard cones with a drill/file.
I use a shorty cone to clean the look up without effecting air flow.
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