windscreen ducts are a problem for that as people do not realise they are mounted with a blind headed bolt on the top side of the dash and wing nuts underneath so they reef them out hence ears broken off..dont throw them away as i dont have heaps of them because of that reason but they are easily fixed....well yours probably are blockers arent...
on a side note to this i need another hiace, l300,econovan ,bedford to put more plastics in as they are popular and i sell lots of plastic stuff like whats in those pics..and the l300 is almost full..