The RUF style that Bill has is one that provides quite a bit of space, this due to it being essentially flat across the front.
Contrast Bill's bumper with the IROC that tapers to the opening,
or the RS, even tighter
Don't be fooled by the size of the opening, you must have added width to accomodate the hoses and fittings that typically extend out the sides (width). These bumpers have surprisingly little space behind them.
These more limited bumpers require the fitment of a smaller cooler, or a large cooler pushed back against the tub to provide width to accomodate the hoses.