Split intake/ inlet hoses, what size for A42.0 FSI?

[Quattromanta]

Hi, can anyone tell me what diameter silicone hose I will need to replace the split hoses that connect the inlet/intake manifolds? I'd like to order some and have ready for when I remove the intake manifold as it's a pig to remove as you need to remove the throttle and the metal breather hose that comes from the bulkhead.

While the intake manifold is off I'm going to clean the throttle, Idle speed valve and replace the temp sensor because the car revs up and down when warm.

Thank you.