Where can I buy a larger than usual 13x4x4 pull man pan? I want to make Italian style pain de mie bread for sandwich which is much larger size than  the usual 13x4x4 pull man pan available on the market.

Where can I find a larger size baking pan for pain de mie? Are there any alternatives to achieve this goal?
Like this one
Wilton Aluminum Loaf Pan?
Or are there some other requirements?