Correct part# for the upper radiator hose on a 1971 LS5?

What is the correct GM part number for the upper radiator hose (between the rad and the thermostat) on a 1971 LS5 (454)?

3967433  or  3946011 ?  And how it is supposed to look?

Eckler's replacement for 3967433 looks like that:

http://www.ecklerscorvette.com/catalog/product/view/id/354/category/202/

Similar shape by Paragon has GM # 3946011:

https://www.paragoncorvette.com/p-350088-upper-radiator-hose.aspx

while Paragon's replacement for 3967433 looks like that:

https://www.paragoncorvette.com/p-356591-upper-radiator-hose.aspx

I know by experience that the shape of the latter won't fit in my vette.

It needs to be 20" long and the S shape is of no use.

By the way, the rad is a Dewitt's Direct-Fit (aluminum).

Any clue?