hope this is in the right section

so ive just bought some vents for the B pillars on betty (1.9dg) so the vents are great fit a treat in the B pillar but my question is should the same vent fit in the door or are these a different vent/do you not fit vents into the door despite there being a hole for them, as i stated the vents ive bought are first class no issue there i just hope im not having a......moment
cheer
ewan