I drilled a hole in mine with a step bit that went to 1 1/4 so I could see in, then cut with a cordless jigsaw. Be careful, the wires going to done light and maybe brake lights? Is back there, I think that was on driver side. I taped them out of the way while cutting. If u go 6x9, check top and bottom hight, they just barely fit between the belt area and whatever metal was above the speaker.