The DON'T fit thru the opening. The only way your going to get those speakers in is by taking off the panel. There's alot of bolts so start searching. also the speakers don't fit through the bracket so you will have to screw the bracket on top of the speaker. As for the X-overs, stweeters mounted mines under the carpet so people can step on the when they sit back there. I suggest using sum industrial velcro and mounting it ibehind the panel on the body. Also your going to have a little trouble putting 6 1/2 in the front. Every reference books says integra speakers are 6 1/2 but they just don't fit well. depending on how deep your speakers for the front are you might have trouble fitting them in. Also your going to have to make sum plywood brackets. I suggest just adding 5 1/4 speakers and getting a conversion bracket.