1972 Imperial gas line size

Does anyone here has some experience replacing the gas tank sending unit?
I want to replace the send unit of my 72 Imperial but there are not many aftermarket units available. I found two at Classic Car auto parts, one for gas line size 5/16” and one for gas line size 3/8”.

Can someone point me in the right direction please, what gas line size do I need for my 72 Imperial coupe?


Thank you,
Patrick Slegers
Braambessenstraat 46 | 2400 Mol | Belgium
slegers.patrick@telenet.be...

1972 Imperial gas line size