Help purchasing a new fuel tank/sending unit?

The smaller sending unit is 5/16" (what most slant 6 cars came with) and the larger one to upgrade to is 3/8". You could even go with a 1/2" sending unit but not necessary unless it's a highly modified smallblock or bigblock/Hemi.

Not sure what you mean about the hose...??? Hooking up the hard fuel line to the sending unit coming out of the tank? You cut to length...

I got my fuel tank, sending unit and tank grommet from Vansauto.com

They were the cheapest and shipped same day, got all my parts 4 days later...