They just keep getting bigger and bigger
I know its not a Benny, but I'm sure they'll be offering them sooner or later. They already offer a single 600.

Mercury Racing celebrates 50 years, unveils 500R outboard | Boating Industry
On Wednesday evening, Mercury Racing continued its 50th anniversary celebration with an exclusive gala in Charleston, S.C. for boatbuilders, dealers,
boatingindustry.com
I know its not a Benny, but I'm sure they'll be offering them sooner or later. They already offer a single 600.