Like others have said these adapters have 5.25" cutouts (or close to) which requires trimming to fit a 6.5" speaker. They are made of a pretty flimsy plastic which vibrates at higher volumes unless coated in deadener (which I recommend if you actually rig them to work). I ended up snapping one while installing but ghetto rigged it until I can find some decent 6x8's so I can toss these. If you NEED an adapter I suggest taking up some novice wood working and fabricating one out of mdf or something of similar quality. These are not worth the hassle.