WANTED Fuel Sending Unit w/ 3/8in line for a C-Body?

[Noxxender]

Hello,

Switching a '67 Plymouth Fury III Convertible to EFI w/ the Holley Sniper system and it recommends using the 3/8in line for fuel.
It has the 5/16in sending unit currently. We ordered one from rock auto that was allegedly 3/8in (SUDG-30) but after 3 weeks and 2 returns I'm pretty confident the listing on their site is just wrong.

Poking around the internet I've only seen 5/16 available for C-Bodies. Anybody know where I can find a 3/8 or if any a/b/e body would have the same gas tank?

 

[volksworld]

i swear Vans Auto has them but their website hasn't been working for a couple weeks

 

[Boydsdodge]

Are you planning on some racing? 1/4 mile, extended wide open runs? If not 5/16ths should be good. Just make sure you eliminate restrictions in the lines, as in fuel pump and filters that are 1/4 inch. I have seen them.
Left is Fram from parts store from the 73 Chrysler listing. Right is a Wix from sam listing. Both are listed as 5/16ths.