Had my 75 for about 6 weeks now, after reading this thread I thought it was time I checked mine.
It appears that someone has modified my central one - it has a grommet type thing at the top, which looks like the original, but there's no centre in it.
Underneath that, there is what appears to be a length of rubber tube with an inner diameter of 10 - 15mm which goes town to the floor level of the car.
Shine a torch down and I can clearly see the road underneath, it's not blocked & my plenum's bone dry.
Seems like the old girl's had a pretty enthusiastic owner at some point.
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