yeah killuminati i know those air vents sh*t me to tears as well. With alot of agrravation taking them out each time i've taken the door trim off though i've think i've gotten down a good method for it that doesn't involve having to pry away painfully with a screwdriver - you can get them out with your hands. If people are interested in the next couple of days i'll try and take a few pics, cause it's a little hard to explain, i just wish i did it this way the first time so my doors weren't all scratched up. By the way, i want one of those damn o-rings! lol. what section are they found in at supercheap???
P.S. if you break the little red lock inserts, you can pick them up for $2.30 down at your local holden parts dealer. This price was current as of about a week ago as i've managed to break one so i know.