i only know that the bluetooth was a optional extra and had be ordered on purchase , but this little bluetooth board is available from various sources , but i am not sure where on the logicboard it should go ,as i was never interested in bluetooth
the airport express is the one you need for your 1.42 fitting the airport is simple just open the flap of the dvd drive there you see 2 screws , unscrew and take the cover off and you see a slot for the airport express card , but there is a catch which leads to nervous breakdowns :
just pushing the card in there does nothing you have to push in really hard an lose any sense that tells you to stop pushing in fear of breaking something ,until the emac starts moving on the desk, to make sure its seated proper push it along the desk for a foot or more ,until you are absolute sure that the card will not move any further in 🙂
then connect the aerial which should lay around in there and you should have airpot express showing up in about this mac more info