
Re: Mistral One Design Trimbox Fin - need one
Early Mistral One Design had E-box while later versions switched to much stronger Powerbox.
If you have a single fin screw through the deck, it's the later Powerbox shared by Mistral, Fanatic, F2, etc.
Just about every major fin manufacturer offers fins with Powerbox base so should be no problem finding exactly what you want through a local shop or website catalog.