Depends on your boot foot print. Vans have really wide foot prints...
I have size 14's Vans and I can't fit into L-XL Rome bindings.
I can fit into Ride, Union, and Burton bindings.
I hope to try Flux bindings this season but it's not certain whether my boot will fit or not.
It's sticky and depends on the company or even specific model.
My advice is to not go buy a specially made binding... You will find a good binding big enough for your boot, I promise.
"When I do good, I feel good; when I do bad, I feel bad. Thatís my religion." - Abraham Lincoln
Moral of the story: If your going to rob people, wear a diaper.