Husky does not list having floor liners for the E450, but they do for the E350. I had assumed they are identical but am I wrong? I don't want the hassle of returning them if they don't fit.
I had a 2011 350 and traded on a 2014 450 and everything cab wise is the same. The chassi I think is the only difference, 450 is heavier. That is my observation anyway.