Thx Steve !
The part number is always 901 108 321, no matter if small or large diameter.
There are only additional markings with 1R or 0R,
whatever they mean.
'67' or '70' should stand for the year of production.
If I would be convinced that magnesium welding will be successful in this case,
I would go for it.
Are the early manifolds made of magnesium ?
Here a picture with the difference.
On top a '70' manifold, below the '67' with larger cross section.
