I just notice that they don't have a lefty truss rod cover! Gotta admit, I'm a little surprized for Duesenberg. LoL.
That's true for the Duesenberg - and yes, @Henry : at such a price range, the Truss-Rod cover should have been Lefty !
I can redesign a LH TR cover, but since it is a die-cast, it's somewhat complicated...
I know an old Guy (excellent mandolin player by the way) who was an artisanal founder of precious metals, sepcialized in medals, trophys, crucifix, etc... He still have all the tools to work in his shed. Now he's 90, so I am somewhat reluctant
Otherwise, I can design one and have it engraved - inspired with one of the original logos of Duesenberg Cars (not the guitars) - particularly this Art-Deco one

A+!