Fuel sending unit.

I thought while replacing the tank I would replace this as well. The local parts store as well as on line show 3 different hose sizes. I have seen 3/8, 5/16, and 1/2. Also the ones I have seen have an extra place for a hose that my 65 doesn't have. I see one on ebay that looks more like mine as far as only having the connection for the hose and the electrical plug. Maybe That would be a better bet.
Thanks
Hope it's warm where you are. By Sunday in N. C the high will be in the 20's with lows in the single digits. No snow, till maybe Tuesday.