I was determined to get a set of these wonderful speakers and mount them in my 2006 AC. Everyone of the dealers and sites said no way. First of all they are only a little over 2 1/2 deep, the problem is the outside of the spider at the mount ring is bigger than the opening. I was able to make a shim ring to get them in there, but the door panel will not snap in place around that part of the door. I put some sound deadening material there to dampen the panel and I just live with a 1/2 inch gap .You have to look down there to see the gap, and the Signature Reference speakers , while over $700, have given me the awesome sound quality that I never got in the 6 years of fooling with sound in my 2001. I will continue to get them mounted perfectly, and would welcome any suggestions, but the sound is perfect.