Vespa 150GL - SHBC 19/19 - Intake manifold


I own a belgian vespa 150GL (MISA - VGL1T)

I 've replaced the old carb DellOrto MA19C by a DellOrto SHBC 19/19. 

I need to adapt the intake manifold (3holes) because the connection is now 23mm.

I would like to know if the SERIE PRO Intake Manifold 21500080 or Intake Manifold 15820000 fit my engine (curvature/design) or do I have to adapt the original intake manifold (merge the original one with the connection of a new intake manifold (23mm)) ?

Thanks in advance