Fuel Tank Pump Cover Needed

Hi,
I have a 2011 Supra Sunsport. The boat has a fuel tank pump access port in the floor just in front of the back bench (just in front of the motor). The port is normal covered by a plastic black disc that screws in. Somehow our disc is missing which means we basically have an open port in the floor of the boat that a foot could get caught in. Does anyone know where I can get a replacement cover/disc? I have done google searches and haven't been able to find anything. I can even really find a good picture of it although I am attaching and overhead shot of the boat from the manual with the disc circled in the image. Any assistance anyone could provide in helping us locating something would be appreciated.

Thanks