Rocker arm shaft...

[t_of_sweden]

I have bought a new pair of rocker arm shafts on e-bay from a seller named "old-parts".
They don't look similar to the originals and I wonder if this is going to work?

Can the extra holes in the original shafts been an idea that didn't
work out so well?

Looking forward to your answers.

[Theo]

Both work fine. Some don't even have the grooves. They work fine too