I put in those speakers last weekend. Originally I tried using just 3/4" spacers that I made, but they still didn't clear the window. I added on layers of sound deadening I had left over until they cleared. I ended up adding 3 layers. So I think it needs about a 1" spacer then. Also, I dremeled off whatever I could of the screw that holds the white nut to the window that's right behind the speaker. The East Coast Scooby spacers are 3/4" I believe.