Jupp guys, thats the mold.
I guess i end up with ordering a blank mold as you suggest.
One way to get both halves lined up is to drill an pilothole straigth thru the mold.
But then i will have fill that hole with epoxie weld.
Is it an good idea to justify that this blank mold (and offcourse some more to save shipping on each item...) is a live or die item come next summer?
I gonna keep you posted if i get around to do this project.