I searched couldn't find any other threads, so maybe I have the wrong terminology.
Is there such a thing as an insert, to go into the filler neck, to prevent the gas from sloshing out on a Righthand turn, when the tank is full?
All newer vehicles were equipped with the trapdoor the the pump nozzle goes into.
I'm thinking about fabricating an insert, but haven't figured out how to secure it
(No, I'm not going to try to weld it

)
Some will say "Just relocate the tank", but I want to leave it in the cab.
Back to my original question.
Is there a vendor that makes/sells an insert like this?
Thanks in advance