the Memphis has a larger magnet, and wont sit in the existing hole without modification. I went a different route with both. The Kicker I modified the mount ring to contour to the box. The Memphis, I modified the box (I used a Dremel to cut out material). Both boxes I used plastic epoxy to fill any holes and gaps that where visible, or perceived. I also used 1/4 foam rubber (Artic King Brand) from Home Depot to add to the inside gap of the spacer. I did two layers inside the ring, with the first layer being partitioned to fill the space between the plastic reinforcements inside. One difference between the two is that the spacer needed to be trimmed on the inside due to the speaker flaring. I cut about a 1/4 down at about 30 degree angle on the inside top lip.
I did find sheets of polycarbonate on amazon that would work for the kicker in this way: Remove the raised sections that surround the existing hole, scruff up the area with sandpaper. and glue the sheet, cut to size with a hole, in that area. I feel the Kicker setup is best, especially if you want least amount of work. The Memphis was more work, especially with cutting, but it does have a grill available, or you can modify the stock one like i posted previously.
