70-71 Cuda fuel filler neck.. all the same

Hello all!

Have a question.. there is 2 styles of original gas caps for Cudas in 70 and 71.. vacuum and vented.

But is all 70-71 cuda fuel filler necks the same?

Thanks
Nicklas

Early model and late model necks starting on the 70..even the 70 uses several caps

only the caps vary,
the filler neck "tube" was the same for 1970 and listed as thru 6-1971.

the caps had different versions for both years

here are 3 different versions of parts books for reference