well, here's some pics of someone else's accord, but they look the same as mine:
the stock speaker:
http://img222.imageshack.us/img222/4017/pics022iz5.jpg
and behind the stock speaker:
http://img170.imageshack.us/img170/9405/pics036sg4.jpg
if the civic is the same, the plastic piece in the second pic will have to be removed or altered. it doesn't offer nearly enough mounting depth.
when i put in my infinity reference 6.5's i just took out the plastic piece and drilled new holes into the sheetmetal of the door.
for the rev's i decided to cut out the back of the plastic piece. it took about 5 minutes with a hack saw and now they fit perfiectly! and then all the screw holes line up so it's a very easy install. i suggest this method!
good luck. i'd try taking apart her door first to see what's back there.