Hi emiel
here is a photo from the "german^ rear towing device from my tvo

and here one from my friends power major
and here one from the tvo-manifold

if you look on the manifold you can see where the crack was.
between zyl.3 and zyl.4
(the extra piece of casting on the rear,the manifold was recast in this place)
that means not welded!!!!!! the job was done in a casting factory here in north germany.
normally they are fabricate/cast new manifolds for lorrys/tanks etc.
so i am do not need a used spare manifold (impossible to find here !!! )
and one photo before i start the restauration

and i am living 60km south direction from bremen
hope this is helpfull for you
mbg jan