I am replacing all fuel, oil, vent and engine flex hoses on my 65E. The parts lists shows a hose on each side, in the cabin, going from tank to selector. The parts list says 610034-27 hose. I have all the other flex lines out and in a box for replacement, except these two cabin ones. Tomorrow I start disassembling the interior lower dress panels to get to these. What exactly are they? Are there special fittings or clamps or just low pressure slide on? What type and size of hose? Do I need to drain the tanks to change them or just use a fast finger stop? I bet the ones in there date to 1965. I understand these are often overlooked and neglected. Thanks.