This small platform is designed to fit around an I/O engine with two handle brackets. It measures 15 1/4″ deep by 18″ wide at the widest point (387.35mm x 457.2mm). The swim platforms are 2 1/8 inches (54mm) thick.
The brackets extend out 21 inches (533.4mm) and the measurement between mounting holes is approx. 12 inches (304.8mm). The overall height of the bracket is 14 inches (355.6mm).