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No They ALL Do not interchange???
I have contacted Late Great Chevys, and they told me that No one to their knowledge is making them (canister unit) at Present????
BUT I can (modify) a common 3/8 one to work in place of my Canister one.
Only the 67 Impala and certain cars came with a canister type fuel tank sending unit.
So you need to research your info BEFORE stating that they ALL interchange..
BUT Thanks for your Opinion..
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Oh you talked to late great chevies
Sorry I gave you incorrect information

Humm.

Lets see big old cannister in the tank with a 3/8 single line.
original Gm part number 6427218

originally installed in 67 pass all except 35/45
with 327 396 engine and all 67 427 first jobs with single line.
sup in late 67 with part no. Late great should know

68 all except 35/45 with 327 250&275 hp and 396
69 all 11 37 39 47 67 69 with 327 and 396
70 same but I won't go into details

I can put my hand on three in about 30 minutes and if I looked about 3 more. Probally would have helped you out with one but now after your comments you can let late great take care of you.
I suggest before you rip my feedback do your home work since my comments are not based on an opinion..I was only trying to help and make you aware it is not a hard item to locate