sure, you can remove the white plastic posts that help carry the daughtercard.
Remove the motherboard, remove the posts from below, and reconnect the motherboard.
Tedious-
and I think you'll find that the airport slot is not a pcmcia/pc card slot, so your silver wavelan card may not even work once you physically fit it in.
I'm not positive of this, but it's been the advice that's been handed out before. Please try and find out, or- I do have an airport card here that I bought and used once for three days with an iBook800... it's still in the box...