Adam- The speaker shown is the DS60 that we used to use at Malibu several years ago. It is same or similar to the in-boat speakers that were in Malibu at the time. Most cans will use what we generically call a 6 1/2. The DS60 shown is generally referred to as a 6-inch. The adaptor might be there to allow use of the DS60 in the can which might have a srew-hole and thru-hole cut for a larger 6 1/2. Without going into a lot of details, for car speakers, there are some loose standards. Certainly within the Kicker brand, we can count on bolt holes being in the same place, so you can at least comfortably go with the current DS600 as a direct bolt-in replacement as thesack shares above. You could also step up to the KS600... I will also agree with thesack that you will be in better shape if you can take the can and test fit. I have a hunch you can put a larger 6 1/2 in that can and get a little more cone area, and a little more power handling. A Kicker KS650 might fit well, but again, take the time to really fit it; make sure you like how the speaker fits and sounds, and how the grill looks next to the can. Finally, TigeMike is on the money too... Under-powering blows more speakers than people realize, and you should take the opportunity to set any new speakers up right, and that might require a bigger amplifier. you have 4 speakers, get a four channel amp if you decide to upgrade. Good luck and let us know! Phil Kicker
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