hope this helps but to remove the speakers on an 01 ciivic 2door model you need to remove the rear seat completely and the reardeck lid plus the side wall covers as well... not to mention taking off the fronts seatbelts fron their bottom ancor so you can pull off rear side moldings

on a 4dr the rear seat still needs to come off and so does the rear pillar trim panel

all info from the crutchfield install guide for 01+ civic


hope this helps

btw crutchfield just guesstimates what will fit in your car and some models they say wont fit might actually... but i suggest you go with what they say fits as other versions might reguire cutting or adjusting to fit... as for the front speakers the reson they say only few will fit is because the woofer at the bottom of the door has a wierd plastic moling behind it to sela out moisture (idkw) you can cut it out and fit a deeper speaker.. but if you dont want to get tooo involved in your speaker upgrade go with what fits automatically.