Hi, I've been reading through lot's of threads regarding Parker fuel tanks. Much good information. Many posts discuss inspecting and changing the fuel sender gasket as a preventative measure. I'm not an expert at forums and I've searched and not been able to find where one would find the gasket? Would someone please let me know what gasket I need and where to purchase. I've looked at Cecile Marine and not seen it there. Don't mean to be ignorant but there is also mention of O-Ring replacements on hatch covers, I'll look again but don't recall seeing the manufacturer of the hatch listed so I would also appreciate any help in identifying the brand for replacement rings. Thanks in advance for your help and will try to keep the questions to a minimum.