It is due to the depth of the speakers. Find the top mount depth on the website, then remove one of the speakers and measure the depth available. There is a plastic "basket" behind the speaker, which can easily be cut to allow the larger magnets to fit, but I say to measure to be sure the magnets wont hit the window when its down. You can also use spacers, either made out of MDF or plastic ones are available at stereo shops, to gain a little extra depth if needed, but then you need to make sure the door panel will fit on and there will still be clearance for the woofer to move freely.